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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?
I've considered going the other way with our bathroom, and just having one switch for everything, as we almost always use the fan and lights all at once. Have you considered just having two switches, one for heat lamps and one for fan and light?
A smart switch just sounds like something to go wrong to me.