Generally leaderboards are created when 2-3 people have run a category, not just one. perhaps you can talk the mods into creating one with just one run for this, although it seems kind of similar to low% no damage for that.

in any case you'll get much more response in the discord than on here.

You will probably have more luck joining the discord and asking in there.

this wiki pages explains how to get Lonk at the beginning (thats the getting knocked into a doorway glitch) https://alttp-wiki.net/index.php/Lonk

For the uncle jump thing, i'd recommend just joining the discord and asking in there. I'm not aware of a good resource explaining it that I can easily link to.

Runs done on original SNES using flashcarts can be submitted as being run on SNES hardware.

Here's a video explaining how to do that, it's called a "stair clip" or "stairs clip."