A Quest avatar only needs to use the same armature from the PC version right? In other words can have my proper PC avatar model/textures, and the Quest version can just be a completely different set of assets? 

Eg. Have my PC avatar, and then Quest version would just be a cut-out cardboard standee with a picture of the PC avatar on it, and some shitpost text along the lines of "Sorry you're on Quest, kiddo".