It would make alot of sense (especially if NZ could be (convinced to be) integrated into the Aust shipbuilding programme (in a full and proper sense not just the Hunter project). It would do a lot for Aus/NZ Closer Defence Relations, mean that the Aus & NZ Gov would committ to long term planning (naval capabilities and coverage etc) .... especially if NZ industry could join in, as they did with the ANZAC Frigate programme, meaning that NZG accepts the higher costs associated with (continuous) Australian ship building with continuous NZ industry participation (and resultant taxes and spending stimulating jobs and economic development).
According to Page 7 of the report RAND it suggests these higher costs could be reduced (and hopefully be more palatable for the NZG)?
So for the RNZN, it means the have (continuous) vessels available (no matter which class/capability), as sometime RNZN seems to be hit with key personnel resigning due to the lack of opportunities to go to sea etc). Also good for recruiting (stable career prospects and promotion opportunities etc).
But back to the Hunters, it would make sense for the RNZN to be as fully as interoperable and capable as the RAN, wouldn't it be great for the RNZN if they could.
However would the USG sell to NZ some of the technology that the RAN Hunters will acquire (SPY and some of the missile tech)? If not, that means a RNZN "Hunter" wouldn't be "the same" as a RAN Hunter, meaning changes in the design? How will that work out?
Should be a good test of US-NZ relations. Alternatively could the CoA "acquire" these vessels (100% compatible as the RAN Hunters) and "lease" them to NZG? Could that be a workaround? From a NZ perspective it would also mean the dreaded "Capital Charge" probably wouldn't apply, meaning not inflating the defence budget which could be a major benefit for the NZG to "afford" 3 vessels not 2 ...