It's possible to get gamepass and steam (and epic and ubisoft and itch.io) to both integrate with Playnite launcher.
This would still require you be able to run the xbox launcher, but it makes Playnite the interface you use and the other launchers are just opened in the background mostly, except for updates.
Anyway Playnite is a very customizable and lightweight open source launcher and maybe you might like it even though it doesn't actually solve the problem you're talking about here.
Edit: Playnite works on both windows and linux.