> I don't have any reason to believe that similar projects won't work for the new version.

Sc-controller theoretically works, somebody with the hardware has to test though:

https://github.com/C0rn3j/sc-controller/issues/98

SDL2 and SDL3 have steam controller support. Also, now that SDL2-Compat is a thing (alongside sdl12-compat), this means literally every game/software that uses SDL 1-3 for controllers on Linux (and windows too) should support the steam controllers.