This probably isn’t what you want to hear but you can make a really really great split setup using SteamInput. The only reason I haven’t used it for the final game is because I play a lot on desktop, not just Deck and I don’t have a steam controller. But on Deck with its trackpads I can access most of the UI and still have the trackpads for selecting items and combat. I guess the only big thing you can’t do is move the party with the left stick, but they didn’t bother me too much. I think I might prefer it to either purely kb/m or controller setups.
I just can’t wait for FSR2.2 which I hope and assume will be better than 1.0 which is absolute trash. I just can’t see shit with that turned on. The only time it’s acceptable is maybe at higher settings which basically bring no fps benefit. I’ve been really happy with everything on Low, no FSR, TAA and max FX Sharpening and unlocked framerate. Looks really crisp. But obviously I welcome future optimizations.