I had an idea about setting up for the eve fight, spent a couple hours testing. In Akropolis tower I grabbed the Tactical Vest so that a belt pouch would be in Aya's trunk. I grabbed it in MIST before heading to dryfield.

Grabbing vest: ~5-6 second time loss, can probably cut it down to 4-5 with optimized line

Grabbing belt pouch: I wanna say this is ~6-7 second time loss. However, I noticed you cant access the trunk within MIST until pierce stops moving, so it may be less of a time loss to grab the pouch once you get to dryfield instead. I held the pouch and used both pouches in the puppet stinger menu.

So heading into dryfield with about a (worst scenario) 11-13s loss, you can have a total of 7 attachment slots going into the fight with eve, using the extra slot for another pepper spray, 5 total used on Eve.

I tested this with 2 different loadouts, both using the EdT (berserk). The normal strat with grenade pistol, and another loadout with the normal magnum ammo in place of the grenade pistol.

I did about 45 runs of the eve fight, I only recorded 8 kill times for each loadout, started logging times after I figured out the optimal time to use the GP or normal mag ammo, and either messed up an item use or eve punched my clock all the others. These times are mostly optimal runs of the fight, some taking a hit + metabolism use, usually with minimal movement after the stun-locking before she goes down. I did not keep track of which runs were the quick jump from the start, or the 1-2 charges then jump, mix of both for each loadout. Each of these times was where either the GP or the Normal MAG finished her off (NOT the maeda rounds).

The times recorded are from the heartbeat when the fight is starting, ending at the kill shot (in minutes : seconds)

Grenade Pistol times: 1:05 | 1:06 | 1:12 | 1:33 | 1:13 | 1:02 | 1:00 | 1:20. Average: 1:11 kill time

Normal Mag Ammo Times: 0:56 | 1:27 | 1:12 | 0:59 | 0:58 | 1:04 | 1:02 | 0:55. Average: 1:04 kill time

With the last pepper spray, you get 2 shots with grenade pistol, or 5 shots with the normal mag ammo (6 if you're feeling risky). I found the grenade pistol would typically blow her bottom piece off at the 1st or 2nd shot, or just outright end the fight within those 2 shots, of course this is heavily dependent on the crits from the maeda rounds. With the mag, it's 5 extra chances to crit, which can do more than the grenades, but it's a game of chance there, and also highly dependent on the maeda crits. I was able to get the lowest kill time of 55s using the mag, but I found using the mag typically led to you having to run around more after the stun-lock.

It's hard to say if this would be a new strat to consider, because you won't know what rng damage you'll get until the very end of the run, but it led to more consistent kills on the bridge (for the most part) instead of running around the arena after the pepper sprays. I would say this could be a viable time save a good portion of the time (?), depending on average kill time with the typical 4 pepper spray strat. If you were to finish eve with only the maeda rounds, then the extra belt pouch would be a straight time loss to your run, but those seem to be few and far between.

Not 100% sure on this, but it seems like it could be used to shave off some time on a run. What do you guys think? Let me know if you have any questions.