Try the country areas. Tower Aviation (Whangerei), the outfit at Kerikeri (can't remember the name), the aero club at Kaikoura north of Christchurch. The smaller places are normally keen for senior c-cat instructors, which is probably where you'd fit in to the NZ scheme. There are many other places that you could fit in to, providing you showed yourself to be the right person for the job. (And 60% of that is to show yourself in person!)
You can find out how to convert your license
here.
Common sence really Thump&Go...
