As a left field idea how about replace both the 757 and the 130 with C2s, say 6 or 7 aircraft. and to really improve the synergies get the P1 as well.
I have recently become a fan of the C2 because it is the only viable option, since the close of the Long Beach facility for C17 production (not a fan of A400), for out size loads.
This is a big aircraft with a price mid way between C-130J-30 and A400. The cargo bay is comparable to the A400 in both volume and carrying capacity. The deciding factor of moving to the larger capability will be the ongoing operating costs. As has been stated before will this be too much of an aircraft for the lower weight / partial loads? Even a mix of 3 C2 and 4 KC-130 or KC390 would offer an increase in lift over the current aircraft but passenger comfort would still be an issue I would presume.
You beat me to the post 40 Deg South as I was thinking about the hub and spoke delivery of cargo on my drive home tonight. Good job and well said.
I have a feeling that anything less than a C130 in capacity is being interpreted as a loss of face in the eyes of some people but I see it differently. Mr.C used a term a couple of years ago in a post where he described the RNZAF as a "boutique air force". I think a better description is a "niche" air force offering capabilities that few others have. As has been stated, the RNZAF is very proficient at providing the services it does with the assets at its disposal.
I view capability as an ability to provide a series of deliverables to government. The fact that NZ is so distant from a large portion of its AO has implications on the selection of assets but looking at the hub and spoke model that 40 Deg South described I see this as the niche that the twins can provide in addition to all the home based tasks listed. Like the C27's in OZ the twin lifter has the ability to be the intra theatre lifter in support of coalition Chinooks.
I don't think a Hi / Lo mix is the right way to go, as my preference is still a three type fleet, but it does offer a lot of flexibility without loss of capacity IMHO.
I compared the distances today that NZAF aircraft have to travel to get to its northern AO in support of the island nations and I compared it to where I live. In the long running saga of trying to replace our legacy Hercules that are used for SAR coverage and secondary transport the choice of aircraft is going to be C295 or C27J. KC390 has been bid but Bombardier will lobby against Embraer. Looking at the AO of fixed wing SAR aircraft from the Greenwood base here in Nova Scotia they cover well into the north of the country to Baffin island and beyond as well as 1000's of km from shore to the middle of the Atlantic ocean beyond Newfoundland as we currently only base three AW101's there for SAR coverage, no fixed wing based in Newfoundland.
In the end the final decision will be influenced by overall cost, not capability. I am old enough to have witnessed this in much of my life. We can only hope that when the decision is finally made that the RNZAF has aircraft that will serve them well, are safe and are well supported.
This discussion is not about influencing others to change their minds or to have influence on government decision making but to provide a perspective for conversation.