Also, it appears that residents of New Zealand (who may be foreigners) can buy existing homes [1]. So apparently it would still work if you can move there and establish residency, but not for buying a second home while living elsewhere.
Seems pretty sensible?
[1] "The country’s proposed ban on foreign buyers, which would only apply to non-domiciles" https://www.theguardian.com/world/2017/oct/25/new-zealand-to...