MAck E we're talking Saab 340's not A380's. They wouldn't be flying from busy city airports much & talking routes that aren't currently flown or not flown nonstop by the likes of Rex.
Most of costs are already there.
How much does it cost to lease a Saab ? $25k/month ?
Does a NZ AOC holder need to do proving flights ?
Plenty of charter type work + could probably operate regular scheduled charters & not be subject to CASA RPT rules.
There's some confusion, as in NZL there's no differentiation between charter & RPT apparently.