I had a Z-Wave garage door opener which was wired to my old garage door opener's button switch port. The old unit's logic board started having issues, so I went ahead and replaced it with a cheap Chamberlain. I got the most basic unit thinking the one-button opener would be a basic switch style like old, but alas it is still some kind of serial connection. The Z-Wave controller can't effectively signal to it, but since it has a basic tilt sensor it can at least open the door state.

I'm thinking I'll just get a cheap garage door opener remote, solder the trigger pin to the button on the remote, and tape that to the ceiling next to the z-wave controller. Janky, but at least I'll be able to get it functional again to send the command.