If you have significant experience doing utility work at altitude in Bell mediums, then Hevi-lift, or Pacific may be worth contacting.
There are Canadian voices on the radio here (Western Highlands)...
As said, conversion of any ICAO license is straightforward. Medical, Airlaw exam, letter from your authority, and paperwork.
Biggest problem is there is plenty of pilots with PNG experience looking for a chance to go back. However I would still contact the above.