BoiGeorge
since his name is all over britain perhaps all over the magical world even, I highly doubt that voldy will miss Oz. He will be on his radar, it only make sense, voldy pretty much is a simp of salazhar, merlin was salazar student at one point in time. Asking what your plan in the goblet event would be silly, but I do hope he gets very involved since his status would no doubt drag him to the political war for the moment.
I think that fusing the elder wand Oz's wand is right choice and then he should for a lack of words merge the wand with his soul as well as the other the hallows. I mean a stone that brings back dead spirits temporarily, a cloak that could hide you from death itself, and a wand that makes you virtually unbeatable if you aren't a idiot and when he fuses his and with himself he would be able to cast all the magic wand less and later on chant less. just think about it author san.