For anyone who’s still looking for a decoupled switch, Z2MQTT has just released support for the Aqara Z1 Pro which, on paper (I don’t have one myself yet) can do on, off & hold.
Strangely, only the 4-gang version lists support for hold commands - the others with less gangs only seem to support hold for the slider on the side.
It sure is one nice looking switch, though.