I’m in the same boat with around 80%… Original 512gb and it’s spent the last few years entirely plugged in. Eventually I’ll have to use the more battery health as an excuse to upgrade to the OLED.
Have you looked at any of the OLED screen upgrades for the deck?
Do you have your own copy of GTAIV also installed? I’ll give Bottles a try, but Lutris was only struggling because the mod was unable to find GTAIV