I think there are alternative FOSS launchers that you can use if the issue is the launcher itself. On the deck I use Heroic, I think there are also for windows.
I hate being that guy… but nobody is emulating windows. It’s a compatibility layer. If they can emulate the x86 instructions (like apple is doing with the M chips and some open source implementations out there) then he compatibility layer could be 100% compiled for arm.
I’ve seen pc games running on phones using this tech. With valve backing, it’s definitely possible, but not before stea,m deck 3
The current, unavailable for general download, is Steam OS 3. Valve just refuses to put a number 3 anywhere, do they just pretend the other two do not exist.
BTW, there are a few “almost steam os” out there. I can vouch for Bazzite, it’s fedora based and really good. Very welcoming for beginners, but had a lot of options of you want to dig a bit.