Actually Gooey's suggestion has some historical precedent.
WW2: Admiralty supporting the provision of a third light cruiser for the RNZN. A RNZN Naval Board request to Admiralty to acquire three ASW Destroyers if a light cruiser was to return to the RN fleet. A kind of a Tier 1/Tier 2 fleet from a NZ perspective.
Postwar: Light cruisers (1-2) and ASW Frigates (6) was the RNZN fleet in the immediate Cold war period (granted some were in reserve/rotation but by having sufficient "mass" it meant vessels were always available in sufficient numbers for deployment i.e Korean war, Malayan emergency etc).
Even if we go back to Lord Jellicoe's plan of 1919 it was for "
3 cruisers, 6 submarines and, for local defence, 8 old destroyers or P-boats, 18 minesweeping trawlers and 4 boom defence vessels".
For today or correctly a 2030's world (i.e. when such vessels could be built and delivered time-frame wise) I don't think it would be unreasonable for the RNZN to have at least 3 (RAN type) Tier 2 vessels with low crewing and optimised for ASW & MCM operations in this part of the Oceania and patrolling its sea-lanes. Plus at least 3 larger vessels for global operations (eg AH140 or T26 or similar?) primarily in the wider Indo-Pacific. Plus a couple of OPV's optimised for deep Southern Ocean patrol and presence (and underwater ISR) as that area is becoming of increased interest to other players with desires to exploit and control resources both on land and in the sea.
Defence expenditure of at least 2.5% would largely fund this and a better resourced Army and AF. There doesn't appear to be any major issues with personnel recruitment, the problem seems to be that of retaining experienced personnel so of course pay, conditions and accommodation need to continue to be addressed (or be ramped up and sustained rather than piecemeal).
I believe the NZG is on track for this planning wise (current negative press is largely the same Treasury 2024 budget savings cut being restated from time to time) but the proof in the pudding of course will be the DCP and that the NZG and Treasury defines a clear pathway forward outlining how and where expenditure will support their "rhetoric". Anything less won't be acceptable and be deserving of utter condemnation and scorn.
(Mee-thinks or wonders whether the fast approaching change of Govt for the USA means NZG and importantly Treasury, are having to revise any conservative DCP pathways to be more "realistic" for the challenges ahead in these changing geo-political times and our standing with our allies and close partners)!