Hey Sarin
I was in your position about a year-n-a-half ago....
Follow the requirements exactly as given in the flow chart, talk to one of the A Cat instructors in the academy, ask him if he is happy evaluating your IFR skills, and signing off the IR assessment form given in the DGCA website (Provided your upto the standard).
YOU DO NOT NEED TO DO THE IFR FLIGHT TEST IN NZ or have the rating on your NZ licence (But of course, you do need the type rating on the NZ licence)