I've heard of a Kiwi expat coming back from HKG to hire the ANZ B777 SIM and instructor to complete their ATPL.
If the test is done properly to the required standard you should really complete it in an aircraft that you are "properly" current on.
I was fortunate to have completed it as part of my employers training/checking cycle.
My advise to people considering heading overseas is to get the Kiwi ATPL before they leave. If I was doing it all again with regard to the ATPL theory I would take the Aussie/TTRMA option - the sunshine coast operation looks like a good setup, the exams more realistic than the ancient NZ slyabus and also a great opporunity to blaze it up in a "foreign" land.
The only possible draw back about the "back door" option is that some prospective employers may ask/judge as to where & how you achieved the ATPL.
Swamped