By installing this plugin, Non-Vr players Muggles can see Vr players head movements and arm movements without installing a special client. (Also it would make me leap for joy)
(the spigot download if somebody doesn't get it)
I wouldn't think it a backdoor because I've tested it myself.
Though I would really like it to be here. Imagine bamboozling non-vr Muggles by dancing in VR. It would be kind of funny. And battling in the pvp, a sword in one hand, bow in the other.