Just saw a tweet about this and I wonder if anyone has gone down the "more legal" DIY switches and outlets path of purchasing something from AU rather than China?
https://www.mitre10.com.au/arteor-trade-smart-starter-kit
Yes they are in Australia but in theory they should be able to supply a SDoC to make them legal in NZ.
Relatively pricey, but if your house burns down your insurance would probably cover you.