Okay, major update on my reservation. Spoke to Annie at Tesla UK, apparently the European distribution centre supplies VAT-free cars for unsupported countries "all the time". For anyone in NZ wanting a RHD Model S, you can order one right now. From the horse's mouth:
wow thats quite an interesting update given that Stone from Sydney has not mentioned that approach of ordering a car at all in our last few email communications. So are you going to get yours this way?