What do you mean lacking support for keyboards and controllers? Maybe for doing weird custom stuff like RGB, but for anything else they're standard HIDs and will work with anything, no "support" needed. You can plug a USB keyboard and mouse into your phone and it'll work if you want.

I'm currently playing Clair Obscur on linux through steam with a cheap fake xbox controller I got off ebay, and it works perfectly. I'm using an Nvidia card too, and I haven't had to do any customisation or anything.

Easy anti-cheat won't work, so Valorant/Fortnite, etc. are out of the question for now, but any games that don't use that kind of malware are probably fine.