I’ll plug Zooz here. Loved my GE/Jasco but then loved these Zooz more. Z-Wave you’ll pay $30-40 a switch though. I’ve also flashed some WiFi switches like TP-Link to Tasmota and then used MQTT. Wouldn’t use them otherwise — want local without cloud — but that’s me.
As far as the general solution to the higher level question asked, this is the way. For the specific application, can certainly question the question of the multiple containers in the first place.
Experience with home assistant is not this. Everything runs great with extremely limited maintenance many years later for me. YMMV I guess.
Zwave is in the 900MHz band clear of everything else you care about.