Interesting to see you coming back from a NZ ATPL. I've recently gone the other way, Aus ATPL to NZ ATPL. The paper work to meet the NZ 'Fit and Proper Person' requirements was enough to fell a forest. Federal and Commonwealth Police reports, traffic history, previous addresses for the last ten years, countries visited etc etc.
I've been told that The Department of Changing Names will credit the NZ IR Rating on a 'once only' basis to the Aussie one.
The NZ CAA were a pleasure to deal with.