A few years back I went to an all whites game v South Africa. I would say a large percentage of the all whites fans there were of Chinese descent. I may have not noticed except the Chinese friend with me kept talking to people he knew. In fact I remember we were saying if it wasn't for the Chinese-New Zealand fans the South Africans fans would have out numbered us.
Which has made me always wonder if the phoenix advertise their games in the Chinese New papers, radio stations and TV channels in Auckland? There is obviously an appetite for football in that community. It could just come down to awareness and accessibility.
Couple years ago in my final high school football squad, I was one of five Pakeha - outnumbering us were Sri Lankans, Indians, and Chinese, with a group of Koreans as well. Huge appetite for football in many subcultures you wouldn't necessarily expect and I'd love to welcome them to support Kiwi football (most loved to play first and foremost, supporting maybe a Man U or Real Madrid in the process, not even a passing interest in Kiwi football). May be beneficial to brainstorm a few ideas like you mentioned to take advantage of their football interest