Dasuto247,
Here is my callsign.dat file. I have done some of my own over the years when needed. The first numbers in the callsign.dat file correspond with the nationality.
If you want some quick-and-dirty New Zealand callsigns...I just name them after cities, frequently.
# New Zealand Aircraft
Napier-Hastings,9,1
Tauranga,9,1
Hamilton,9,1
Auckland,9,1
Wellington,9,1
Christchurch,9,1
Kiwi,9,1
Dunedin,9,1
Nelson,9,1
Rotorna,9,1
Palmerston North,9,1
Copy and paste these and place them in the callsign.dat file I just attached between the Imperial Japanese Army Air Force (#8) and Australia. (#10)
Thanks. Happen to know any resources to look up names for New Zealand warships to add in? Now that I know what the numbers mean, makes this easier.