I don't think it matters whether you have a current rego or not. Outside of NZ nobody knows or cares, as long as you have an official rego/ownership paper. Why pay road tax and ACC when you are not in NZ and whence not covered. This is what I did in 88/89 and there has never been an issue.
Land Transport aren't going to notify the AA that your rego has expired and even if they did there is nothing the AA can do about it. It's all just useless bureaucracy.
Cheers,
Peter.
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