Hi, I have converted a sample from the preview package, which works with 2021.2.
It shows how to render the UI in a texture (through the PanelSettings configuration), how to apply that texture to 3D objects and how to remap coordinates from these object’s surfaces to the UI space (UITextureProjection script).
I can’t comment on the specific of getting VR input to work. You would likely need an EventSystem in your scene with the latest version of the new Input system package (pre-release). As long as their is a configuration for Pointer Events in there, the input should work.