Relocation, is that part of your plan? In the past, it was my understanding that neither NZ nor Australia wanted pensioners as immigrants. I do not know their current policies, though.
If you do plan to relocate, New Zealand has strict restrictions regarding offshore cruising by its flagged vessels. NZ tried to impose those requirements on all vessels that arrived in the country, prohibiting them from leaving unless they passed the rules and equipment requirements. It rankled the NZ officials that some of their residents held dual citizenship and registered their boats in the UK even though they lived in, and were legal residents of, NZ, thereby avoiding the NZ strict offshore requirements. The law imposing NZ regulations on foreign-flagged vessels was overturned by their courts after a suit was brought against NZ by a foreign cruiser.
I've heard rumblings that NZ is trying to find another way to impose these regs. against foreign yachts, but haven't heard much lately.