In our two bathrooms we have a switch panel with 4 switches: one for a light, 2 for heat lamps, and 1 for a fan extractor.
As we tend to forget the fan extractor I want to make this smart.
Something like 
It has to work well with Home Assistant. WiFi is fine, Zigbee would probably be better. Should not have a cloud dependency, I can't sell this stuff to my SO saying that she can't turn on the lights if the internet is down. I've flashed Tuya based switches and RF emitters with ESPHome using LibreTiny.
As it's obviously 220v I'd like to avoid Aliexpress stuff. Probably also needs a good IP rating as it's in the bathroom.
Any tips?
Mercator have the ikku range of zigbee switches.
I can’t say they’re great as they’re capacitive, and the no-neutral ones I’ve got give up pretty quickly.
But they do up to 6(?) gang. … if you can find them (you probably need to get them from Aus)
Honestly AS/NZ standards are shiiit. If only for having smart things that probably won’t burn your house down, and if they do it’s (less) your fault.