mmm maybe the super base that they be building in broome
That would not only be the most expensive option, but also the least effective.
The cheapest and most effective option would be to base them all at Jandakot, but given the runway lengths at Jandakot, it may have to be Perth.
Basing them all at Perth would be interesting, given how capacity constrained that aerodrome already is.
And to really minimise the costs, the pilot group would have to be separate from the PC12 group - with a different employment agreement.