Hi Peter Muse (Arne) is one person who has been treated here in NZ. I do know of one other. They have both been treated twice and by the same IR.
It is very under cover at this point because they do not want to have the opportunity to go for multiple treatments shut down like has happened overseas.
Others have been treated around the world eg Australia when that was happening. Seems NZ pwms are not likely to get treated in Australia any more, although the stories change that have been reported.
Being treated in Australia is the closest option and it going to be a case of who to see.
As with anywhere around the globe, the experience of the IR is vitally important and you would be advised to check the person's experience and any recommendations you get thoroughly.
Sorry I didn't get back to your PM I have not been well.