I’m sorry friend, but I doubt you’re going to get many responses here regarding this issue.

The overwhelming majority of people with a Steam Deck are running Steam OS on it, and I’d be stunned if more than a couple of dozen people on planet Earth are running your OS on one.

Add to that the fact that many, many people who play BG3 on the Deck are running the Windows version of the game under Proton (both for familiarity’s sake, and to make stuff like frame generation easier), and I don’t think that it’s just that you’re looking for a needle in a haystack… I think it’s more like you’re looking for a specific hydrogen atom inside the sun.