I’m sure both developers would send him a key as soon as he emails them telling them he was requested to work on vorpx intergration.
Cybershoes have mentioned wanting to work with VorpX already so I’m sure they would send him a pair for free if they were to get in touch with him.
Skyrim Together is going open soon and has modding support, but uses the base version of the game, not the VR edition of Skyrim, and has a standalone heavily modified client with a different .exe, so it is practically another game.