The Oculus Quest (VR headset) runs an android system, and through Sidequest, one can sideload an app onto it. the headset also has bluetooth etc connections.

The usecase I'm picturing is a "Reality Ping", where someone presses the Flic button, and the user in VR gets a notification that someone wants their attention in real life.

It seems doable, but I'm not sure how difficult it would be.