I just read about EB3 greencard. The processing times are enormous. Employers are simply not going to wait that long bar some exceptional cases
https://www.uscis.gov/working-in-the-united-states/temporary...
a nz cit can live in au for 4 years then become au citizen then move to the US
if they go to college in au then most likely on graduation they can move directly to the us
Canada is also used as a stopover in this way for those bound for the US.