The current version of Xbox Game Pass for Android now has an Android TV icon, so can be added to the Home screen without any tricks. (There is also a striking Xbox splash screen at launch, I presume to indicate xCloud now running on Series X hardware.)

Surprisingly, the app is not yet available for Android TV via Play Store despite this, so still needs sideloading or installation from a third-party app store like Aptoide; hopefully it will be on Play Store soon.

There is also one regression I noticed. The DPAD_SELECT button no longer works within the app. If your remote (incorrectly) generates ENTER for the "Select"/"Center" button on your remote you won't notice, but for those of us with remotes that generate the correct DPAD_SELECT this means we'll have to use the game controller immediately upon launching the app.

EDIT: Forgot to mention that there is no easy way to get rid of the "New update: Tap here to know what's new with this update" popup without using a touchscreen or mouse. Reading and clearing all new notifications doesn't do it.