Hi Kieran,
Good luck with your plan. I suppose the only note of caution might be in the text of your own post "and benefit from price rises in both countries"
Just wonder when people start to believe that the only way is up whether you are right at the top of the bull market. The whole thrust of current NZ government economic policy is to stop the train. Interest rates in NZ may still have considerable upwards momentum and long term rates are now starting to move in tandem with short term rate rises. You will also have to consider the implications of what is a notoriously volatile exchange rate. Missmatching assets and liabilities can be fraught with danger. Don't want to appear as too much of a jeremiah but sometimes makes sense to look at the potential downside.