Can you to into more detail on your Steam Deck setup? I have a MSI Claw running Bazzite and I would love to look at some different options, especially Alpine.
It's really nothing special. Normal install, add KDE, in my case add flatpak (and associated portal, etc.) to run Steam, and I think I had to add sc-controller from testing/edge which you're maybe not supposed to do but it works and it's useful for mapping the controls. I can do a more detailed write up if it'd help but it really isn't that different from any other x86_64+UEFI machine. I will strongly suggest just wiping and repartitioning the whole disk; I tried to keep the SteamOS home filesystem intact and that just made things way harder than they needed to be.