Luke, split
I agree with you, I didn't do any med stuff myself but know plenty of chaps and chappeses that did/do. Not as glam as it seemed on the face.
Duty times seem to mean nothing and you are always on call (but thats Kiwi GA). In saying that though at least you get a half livable salary and the aircraft are generally in good nik.
Veeneee
The operators in Hamilton are run out of Taupo, other places to go see would be Air Gissy and an outfit in hastings (sorry can't remember the name).
Best of luck in your searches.
splat