I am also interested in this.
- can work in a mode where a press on the button just sends a message via zigbee, does not actually switch the line (for smart bulbs). Not sure how this mode would be called
This is apparently possible for with Shelly switches and it’s called “detached mode” (see here: Shelly Detached Switch - #3 by pickerin), unfortunately those are not zigbee switches.
I tried to accomplish this with Aqara single switch T1 module. I did this by connecting the light switch wire and live wire directly so that the smart bulb always has power. Then I connected the switch module to a wall switch and the live wire. Unfortunately this does not seem to work. The switch does not provide a switch event when pressed. Also, connecting the live wire directly to the switch wire is not ideal because all the smart bulbs will turn on after a power outage since the bulbs do not have a way to set the default value.