Requirements Analysis in the Capability Definition Phase of the MUH and LUH Replacement saw that Option 5C of 10 MUH's and 10 LUH's were deemed to be the optimum mix to meet all key NZDF operational tasking requirements.
What we have is an acceptable solution for now - though no one would disagree if the optimal mix was meet - though it would cost north of $200m. A turnkey lease or purchase of 3 AW109E Power airframes for most of the training curriculum and VIP supplementing the five existing LUH versions with some utilisation offsets flowing onto the NH-90 would be a quick, simple and budget friendly way to boost overall fleet capability as was noted by Wayne Mapp post DWP10. At present there does not seem to be great urgency though.
All projects have options to give a range of choices, costings, considerations etc and all with pathways for each ie low, med, high. The only project I have ever seen get what they wanted in numbers was the NZLAV and that was more to suit the envisaged role of motorising both battalions, a new direction from previous, but as we have seen the constraints of recruiting, operation and funding made this abit of a stretch and therefore ultimately failed and we have reverted back to what we knew, at cost.
I'm confident defence knows exactly how our government works and purposely aims for the high option knowing full well they will get at least the medium pathway (in a way securing it) everytime. I actually saw it in every day ops (albeit on much smaller scales) when requesting or justifying resources, alittle like bartering TBH, start high settle low, to be expected in a way.
Yes I still see the mooted 3 extra 109s as being the next logical step as a way of appeasing any "deficiancies" in fleet numbers and as you say seems to be no rush now so obviously the demand is not quite there or critical as in comparison 3 civspec A109s added via outright purchase/lease would be a relatively simple, straightforward and cost effective option at this stage vs more NH90s. The considerations such as extra funding, crewing, maintaining etc would still be there just not as extreme as new build 90s IMO.