I could be wrong here , but my understanding is that it is VERY difficult for NZ zoos to obtain foreign species of birds -- ERMA , MAF , DoC red tapes , restrictions , prohibitions etc .......regardless of cost .
Personally , if the bird passes quarantine/health issues , I am more than happy for the zoo to display it , although if there is a reputable birder in NZ that can pair it with a suitable partner for breeding , that would be ideal !