Nightflier - Few avenues for you to try.
ARHT (Auckland Rescue Trust)
They operate under their own AOC now and have a newish BK117. Here is their website URL.
http://www.arht.org
Rea Wikaira is their CEO and a good guy, Dave Walley is their CP.
Also try North Shore Helicopters at
http://www.nshelicopters.co.nz
They operate an EC135 and EC145 for a private owner as well as a few BK117s for other private owners. Might be worth a try. Larry Bennet is the owner.
Another option could be Northland Emergency Services Trust. They have a couple of EMS/SAR EC135s.
http://www.nest.org.nz
Try talking to Pete Turnbull there.
Garden City Helicopters in Christchurch have a BK117 on EMS work. Their website is
http://www.helicopters.net.nz
Talk to Grant Withers and or Neil Scott.
Hope these help.
Cheers.