There are some people willing to fight in every corner of the world. Some Jews faught back in the Warsaw Ghetto, for example. This did not stop the Holocaust.
Look to what happened to the Brits and Aussies in Singapore, or the Dutch in Indonesia, in 1942 to see what the Kiwis can expect once the Chinese land and colonize New Zealand.
A handful of soldiers will be a spit in the ocean. A single Chinese Roll on / Roll off ship will be able to launch enough amphibious assault vehicles to take the key ports.
New Zealand does not even have one single jet fighter with which to resist a Chinese invasion.
The Chinese have enough "excess males" to throw a million troops into fifty different conflicts. Millions of Chinese males will be eager to go overseas for the promise of "land and brides," two things they can never find at home.
This will happen after the next global depression commences. Nobody, not individuals or nations, will stay at home and starve quietly. Unsold Walmart-bound boots will be on millions of marching Chinese feet.
New Zealanders will be herded into internment camps. They will no more be able to resist this Chinese tidal wave than the Brits and Aussies and Dutch resisted the Japanese in 1942.
In a century, Chinese will be the language of New Zealand.