

always check protonDB:
https://www.protondb.com/app/1222670
Looks like most people are using GloriousEggroll’s version of Proton (ProtonGE) and some are using launch options to disable the EA Launcher.
GE works on Wine at Red Hat and is thus very knowledgeable about windows translations and the stuff he changes about Valves Proton are often merged down the line, its like an unofficial beta release and I’ve had good a experience with his proton Versions.
That said, to actually get custom Proton Versions I use “ProtonUp-Qt”(available as flatpak): https://davidotek.github.io/protonup-qt/
Which downloads different Proton Versions and manages them for you. You can then set the default for all games in the steam settings, or on a game-by-game basis

Have you tried Wacom?
They have their own TablePCs and manufacturers make Tablet PCs with their digitizers.
There is a community made linux drivers for them, compatible TabletPCs are listed here: https://github.com/linuxwacom/input-wacom/wiki/Device-IDs#tablet-pcs
They also make touch screen monitors that start around $300 (up to thousands) that connect to any PC and should also work under Linux, afaik. Or you could get the cheap ‘old school’ tablets made from plastic that simply move and control the cursor, though they take a while to get used to, IMO.