I need a solution for a hardwired fixture. I thought this Shelly Mini looked perfect, but from reading about it here, sounds like it's not compatible with HE - I have an 8 Pro.
It's a line powered dry contact relay. It doesn't require a switch, but a switch can be connected (and it can be used to trigger inclusion/exclusion without accessing the device, which is nice).
Is there a communication protocol you are locked into? I use an Aqara T2 relay which is zigbee for an on/off without a physical switch. It is little larger and a bit expensive due to having two channels but it works well.