ATPL flight test
Simulator availability and costs would be much more reasonable in the U.S, so you could enquire ( NZ CAA ) as to the availability of an examiner qualified on your regional jet type and offer to pay their expenses to go to the U.S. And complete the test there?
Alternatively the CPL route may be better and then wait for an employer to conduct the test when a command promotion becomes available. ( hopefully at their expense ).