Phoronix article: https://www.phoronix.com/news/Steam-Machines-Frame-2026
Also listed here: https://store.steampowered.com/sale/hardware
Valve has already sent support for the new Steam Controller upstream: https://www.phoronix.com/news/New-Steam-Controller-SDL
I’d think that you could set them to whatever in Steam Input, if you’re playing a Steam game.
https://steamcommunity.com/app/1675200/discussions/0/597397396010388899/
I believe that you can have per-game settings, so just enable them for that one game you want.