That's one of the reasons I say 'reserves' have had their day. The 'reserves' are almost entirely for individual augmentation - it's inconceivable that a reserve unit or sub-unit would be activated for a 'regular' tasks. The reserves are really a structure to hold and maintain skills for individual personnel augmentation. With that premise, a full-time, part-time system would seem much more sensible and help to break down some of the us-versus-them culture that exists.
Properly setup, kitted, trained, and tasked, an reserve units can indeed provide invaluable service. The real question is whether or not Gov't, the NZDF and RNZN are creative and forward thinking enough, to make the commitments necessary to make it work.
As the study which led to Project Protector determined, RNZN patrol asset numbers had fallen to below where NZ could realistically claim to control the EEZ. The Protector "fleet" was the solution the Gov't of the day decided on as the one most acceptable to them to provide an increased patrol capability for the EEZ and other constabulary and lift duties.
Based off what was requested, what was selected, and the amount of funding involved, I am inclined to think the Gov't of the day was loathe to spend money purchasing new kit for defence. Then opted for designs which would have less flexibility to provide capabilities outside of their requested roles, short of a significant dockyard overhaul and modification.
Where this can get 'interesting' is that even with the addition of some of the Protector vessels, the patrol capability is still insufficient, especially given the concentrated nature of RNZN basing and vast area requiring patrol. If some of the more far removed coastal areas of NZ (Dunedin and Invercargill come to mind) away from the naval bases can stand up a unit to perform some of the inshore patrolling, as well as opportunities for personnel get/sustain smallcraft handling, then it would be in the RNZN's interest to form and sustain a RNZNVR unit in that area. Expecting on utilizing reserve personnel to fill out a vessel's crew IMO is not a viable or useful expectation apart from in wartime. If someone is in the Reserves, that is because they do not wish to be in the navy all the time. So a vessel deployment away from NZ proper for more than a couple of weeks is going to be something that personnel are not usually going to want.. Short patrols of anywhere from a few hours to a few days would IMO be something that properly trained Reserve units could do.
What I am not so sure about is just what would be considered a proper sized vessel for them to do so.
-Cheers
-Cheers