It was possible to do exactly that using the WMR start menu overlay inside the cockpit. It’s broken with the latest update but of people would actually ask for it it may get supported again… (Reverb G2 + openXR without additional program)
EDIT: I created a bug report in the forum for the WMR people to upvote if they want to see apps in VR again: WMR start menu overlay crashes VR mode