ChimeraOS is a tricky one of you plan on dual booting, you also lose out on some functionality.
Off the top of my head browsing reddit, suspend/resume can be a bit of hit or miss, the controller sometimes goes wonky and partial TDP control
Edit: have you considered just using steam big picture mode during startup or have a different front end like playnite handling store fronts?
Playnite specifically has an option to launch the storefront when you launch the game and close it when you done.
Otherwise if you are keen, heres a Nobara Guide