Bend alot
It doesn't matter whose Regulations you adopt, by the time they get through Office of Legal Drafting (OLD), they will not resemble what was presented in the first place, so your coveted NZ Rules would look and smell the same as the current CASR's. This is out of CASA's hands, as ALL Commonwealth Legislation is drafted by OLD, this was enacted by Parliament about 7 Prime Ministers ago, so in the last 7 years.