The market is not saturated with people with actual commercial experience. If you have Air Transport time you are in a reasonable position. With your mountain flying and ski experience you may be able to find something around the Queenstown and Milford Sounds area. Unfortunately I do not know who you would be best to contact. Some research on the net may help.
For help with converting licences go to
www.caa.govt.nz
Try to get as many hours in the mean time if you can.
Best of luck though.