Your TWN passport may also work against you as they will ask you if you have done military service or not. If you haven't, they may be reluctant to take you initially. Helps if you know someone in either of the 2 companies. Keep in mind, you could be sent down to Uni or Mandarin as well. Since you grew up in NZ, consider the working culture here - it's not so simple as flying from A to B......
Give it a try and if all fails, go back to NZ and do it the traditional way. Your aviation career will be up and down and there is no guarantees of anything. Meet as many people as you can, don't burn your bridges and you'll be fine! Good luck!