If you have a new 800LR model, Zooz had to make some endpoint changes so it would meet Z-Wave specs. That would explain the issues with the relay button.
I am in the midst of overhauling my switch drivers but I did a quick patch for the ZEN30 800LR which is confirmed to work on both the old model and the new ones. This is outside of HPM and my normal github repo for now. Details are here: [DRIVER] Zooz ZEN Switches Advanced (and Dimmers) - #448 by jtp10181
If you dont have an 800LR model you can try my published HPM driver and it should work.
The "Generic Component Central Scene Switch" driver is correct, it is not only a switch driver but the central scene implies it can handle button presses as well. I have a custom child driver in my package as well but the only purpose is to change the capabilities so it shares out to Alexa and Google better (lets you change it to a fan device).
For the duplication you see, that is in the ROOMS page, not the devices list. In Rooms if you have both the parent and child selected for the room, the child will show twice as you have shown. I guess its sort of a bug in the rooms view. @gopher.ny not sure if it would make sense to NOT nest the child devices in rooms and only show if they are also set to that room???
