This option is cheaper as you only have to pay approx $1500 fees to gain an equivalent qualification in NZ and then use the Trans-Tasman registration process to transfer the NZ qualification to Aus. This seems like a good idea...
To apply for registration in NZ, you have to sign a statuary declatration that you intend to work in NZ. So, I mean, you can try, but it's a legal document, so I wouldn't risk it....