Ars Technica jumped the gun on Valve and built their own Steam Box, and described exactly how they managed it.  This is not a Bazzite build, which offers a similar experience to a Steam Deck, but that wasn’t enough for this project.  In a system built around a Ryzen 7 8700G, SteamOS version 3.7.7 offered nothing but trouble as it was expecting older hardware.  After some research and fair amount of digging, a source for a variety of SteamOS versions, including ones that recognized newer hardware was located.  

There are still certainly some quirks, for instance you may want to disable the Automatically Set Resolution and Maximum Game Resolution settings.  The Steam Box hasn’t been released yet so even the newer versions of Steam OS make the assumption they are running on limited hardware.  The same is true of audio settings, but with some tweaking you should be able to boot directly into Steam OS and fire up your favourite games.

Give it a shot with the info here, if you so desire.