So after a few ideas, I've come up with some solid and not so solid ideas.

My basic idea is. Start on the white rose side. Get a Dancing Elf from Tea. Just after Mai, or maybe even Mako, or maybe even Joey, you go into the deck editing screen.

Now that you're in the deck editing screen, you remove Skullbird, Zanki, and Gokibore. Skullbird and Zanki are removed because theyre not very useful outside of Mai's duel, and you need to make room for other cards to drop your DC as quickly as possible. Now instead of adding a fake trap like you normally do, you add the Dancing Elf you got from Tea. Now you enter the passcode for Dimensionhole. this is something I'm 100% on - the whole point of this 'route' is to include the Dimensionhole, so that for the last 80% of the run you have 2x the chance to draw Dimensionhole, and in some cases even the ability to draw both in one duel which can also be useful. This password should be part of everyones route - not only is it immensely useful but considering you need to access the deck editing screen to progress, you may as well use the passcode for it. Not to mention, the passcode is W1A7W101 - This is actually incredibly easy to enter - the A and 7 are the furthest characters away from zero, the W's require three down inputs, and the rest of the characters require 1 or less input. So for anyone running in the future, you definitely want to use this passcode, it's a no brainer imo.

So after you swap those three out, then include the dancing elf and the dimensionhole, you have a deck cost allowance of 11. Normally I'd suggest using a fake trap, or cursebreaker if you managed to get one from mai, but I was thinking of just using the Violet Crystal passcode because its 10dc and it goes far considering your deck. It's a little bit tedious to enter but considering that would be an extra potential thousand damage in a duel you use zombies on to win, and also it gives you another spell/trap card that you can utilize in other duels for ai manips (such as blocking a summon points of theirs without their deck leader moving away). The reason why I suggest removing Gokibore as the 3rd card to remove is because it is the highest DC card in your deck that wont be useful to you again. It's not used for any fusion and is only useful on forest terrain - which you can summon Chimaira, Flower Wolf, Rose Spectre, and now with the inclusion of Dancing elf, a Nekogal #2, all which give you 2 hit kills on weevil, which is the only point where your forest cards even really matter on the Red Rose side.

You get the dancing elf from tea that way you have a female card. It's extremely easy to get (remember that the enemy deck leader always shows up in the slots, provided their deck leader is obtainable in the slots - so in the run you're already guaranteed to have it in the slots) There are two beasts in your deck, so you can use it to make Nekogal #2, which is mostly for the Richard Duel, but also nifty to get a more reliable fast weevil. This isn't really a major deal but its more useful than a fake trap - which you can use if you happen to miss the Dancing Elf from Tea. You can also fuse the dancing elf with Saggi or Akakieisu to make Dark Elf, which is nice.

You still have a 756 deck cost deck after Bakura, so what you can now do is go back to the deck editing screen for the last time in the run - take out your useless Kattapillar and go ahead and enter the code for Shadow Ghoul - LXNTAHCF. Your DC will still be low enough to duel everyone after Bakura with this deck. Again, the code is a bit tedious to enter compared to Dimensionhole, but Shadow Ghoul is the card which will be responsible for fast duels against Labyrinth Ruler, and all three Stonehenge Duels. If you add it in immediately after Bakura, you can also use it against Yugi, then its immediately effective on the red rose side - it can come in handy versus other opponents with labyrinth such as Keith, you can use it to block him from summoning/moving away from you if you pin him from one side. And dont forget, its 2100 on wasteland/yami, which gives you another 2 hit killer on those maps - which half of the maps on that side have wasteland/yami, so yeah, its pretty nice. Then when it comes to the Stonehenge duels, the Wall Shadow is a two hit kill on the final bosses. This isnt really a factor on Skull Knight because its still better to just do the typical 'glitch guy' fight. But this cuts so much time off of Labyrinth ruler. 2x dimensionhole and 2x shadow ghoul can easily make labyrinth ruler a fast duel when usually its one of the longest.

Another small idea i thought of after this is, when you deck edit the 2nd Shadow Ghoul in after bakura, you still have some DC allowance, so you could enter the code for a 2nd Cyber-Stein and take Basic Insect out to put it in. Considering youre going back into the deck editing screen already, it would take about an extra 10 seconds-ish to do this action, and cyber-stein (especially having 2) helps you significantly with all the decks that dont have wasteland yami - particularly Pegasus but also Richard. So yeah, considering with my idea you're already going to the deck edit screen to add 2nd shadow ghoul, that extra 10 seconds it takes to swap our your basic insect for a cyber-stein i think is worth it. cyber steins code doesnt take that much time to enter. Over the course of adding in these passcodes over any current decent route, you'd potentially lose like a minute max in an hour plus run, but potentially save so much time its ridiculous. This route increases the chance of beating the current world record by not only making it more likely to draw good cards, but inversely making it less likely for you to draw hands full of garbage.

So yeah, basically for this route with these codes, remember that all this deck editing probably adds a minute onto your time for the following perks which can easily cut minutes off the current world record -

You have 2x chance to draw dimensionhole for ~18/21 duels You have 2x chance to draw shadow ghoul on all of the duels that have labyrinth tiles (with the exception of soloman, because he is before Bakura) You have nekogal #2 to make up for not having garvas, which nekogal #2 is also useful on Richard who is one of the duels that is easy to struggle on if you dont get a good draw You still have punished eagle for mai

Considering the duelstrats that cut the most time out of the run involve Dimensionhole and/or Shadow Ghoul, this is the route I propose. I'm gonna try running with this idea soon, I was just waiting to have a peek at figuring out the deck cost levels of everything inclusive, which helped me decide what i wanted to add after the Dancing Elf and Dimensionhole. Just let me know what you guys think about it, what you like about it, what you dont like about it, and feel free to suggest alternatives to anything I've discussed.

I think dimensionhole is a must-have, considering the code is so easy, drawing it always helps, and some duels drawing both is actually optimal. Not to mention the low deck cost. Slate Warrior is also a fast code, but its pretty expensive dc wise, which is why im not a personal fan. its epic for a fast final boss, but I think the other crush duels like Ishtar and Shadi can be done more reliably with different draws anyways - Shadi you just force onto wasteland and hit him with beaters, I think most draws you get there are more reliable than Slate Warrior cause again even if you include the slate warrior, you actually have to draw it during those duels for it to matter. Whereas if you include a terrain card instead, they're always useful, and you have 2x the chance of drawing them - but again, theyre not really useful on half of the red rose side maps that have the whole field your favoured terrain anyways.

I honestly am inclined to agree with shadow ghoul, its quite underwhelming to get two. I'm honestly thinking of putting yami/wasteland in instead, whatever is fast to code. For barrel rock/cannon soldier you'd have to draw them early on in the labyrinth duels for them to matter, and for Soloman, you have 2x dimensionholes so its more consistent to go around with those 2 in the field, then it is to try for a shadow shoul. the shadow ghoul strat needs a really good draw cause you need one, then the blue eyed silver zombie, then another strong zombie in case he uses time seal

And cyberstein isnt that bad imo if you use it aggressive. Enemies will try to attack it if they can beat whatever attack it is before it lays its terrain down, and then you can move it up two spaces after that fight, and leaving wasteland terrain

But as you said, just makes more sense to add a terrain card instead so yeah, i agree, LUL indeed. not gonna bother with this. I'll think about the dc of it again, but again you can fuse it for dice armadillo or metal dragon on the wasteland duels and it leaves wasteland so honestly I dont think its the worst idea, but surely there are better ones as you said

I'm honestly actually thinking of including the aquired dancing elf and also maybe a code one, for more consistent richard. its also a very good card for the stonehenge duels as its 2x hit on meadow.

Mammoth graveyard is probably the replacement i'd want to use for cyberstein, because same dc, but its better overall. especially seeing as i want to include another Violet Crystal, that esems like a no brainer now to be honest. So i'll probably do that instead of cyberstein, and see how i go with it. Cause really, the only time cyber stein seems to pay off for me is a duel where other strats are more consistent

DC wise megamorph is better than violet crystal maybe, so you can 2 hit richard with nekogal, but its still useful enough to make the difference on any card you'd use a violet crystal on, but not every case. These strats really are mixing pots, but again, the dimensionhole should really be a thing in every persons run now, and it makes the game far less frustrating to run, and that code is one of the easiest codes to enter apart from the ones that are all monsters