Yup, sounds fun.
Without having the device I cannot tell you but based on how it behaves on tvs and chromebooks it seems to fail to detect input events if there's no explicit hook on the android view hiearchy.
Fortunately we have workarounds for those, see
https://github.com/koreader/android-...ice.kt#L24-L28
If that works a workaround for the meta quest is welcome