FYI, Appearance swapper in your scene still doesn't work for me. I started digging and the plugin wasn't parented to the Empty (.AppearanceUI) for displaying to UI but fixing that still didn't solve the problem.
In the same VAM session I then loaded one of my scenes that uses appearance swapper and some crazy stuff happened on loading (e.g. girl loaded as default appearance in TPose, shapes in the wrong place, etc). Eventually it looked like my scene loaded fine, but then, even the main UI was invisible. It appeared to be opening/closing when I toggled 'U' key because the screen shifted right/left each time. My scene's appearance swapper also refused to display but it appeared it was open (just invisible) because I clicked in the open space next to the parented Empty and the girl's appearance changed.
Who knows, maybe my experience will help you debug? Good luck. I do love Appearance swapper and hopefully the kinks can be ironed out. For me, I've never gotten it to work in VR mode. It opens but I can't interact with it.
