I hope you find a solution. I grew frustrated with the immutable desktop function of the SteamDeck, so I installed holoiso instead of SteamOS. Seems nearly identical, except that I can actually use the computer in desktop mode. Sleep is buggy now. I miss how well sleep worked in SteamOS.
I was just thinking of this the other day, but didn’t I want to slog through my meme library to find it. Thank the gods for Geert!