Dont change the subject and answer the question why should NZ purchase Hawkei? its a simple enough question.
A couple reasons. One reason is DCP25 calls for procuring the same assets as Australia and second is the integration of C4ISR. While Bushmaster is a troop carrier. NZ Army would utilise both Bushmaster and Hawkie differently than even the Australians would while being consistent with NZDFs own CANOPS or allowing for smaller HQ elements to stay protected and connected.
With factors such as disbanding the ACF and having to resource Navy to a higher degree than traditionally proposed won't be able to afford PrSM. A 6 pack of dumb rockets and a simulator would make the next step up a lot less daunting.
Once everything goes hot, budgets and treasure become available. Until then NZDF artillery requirements. You're probably going to want to be able to drive out of a C-130 and start blasting then shot and scoot. Or something that approximates NZDF CANOPS of an area denial capability that fits within a sometimes 2% budget or better.