Just wanted to post a special thanks to @mitchjs for his awesome RatGDO driver. It's super simple - just install the custom firmware using the web interface, install the custom driver, put the IP of the device into the preferences field, and it works like a champ. SO much easier than monkeying around with HADB and other roundabout ways of connecting these.
The other cool thing is that it includes the ability to crack a door. We don't have a man-door in our garage, so it allows me to crack a door to let the cat in and out.

Here are the instructions he sent me, which worked like a charm:
I wrote driver for RATGDO32, for HE when flashed with the HomeKit firmware
(doesn't use HomeKit at all, its directly controlled be HE)
I happen to be one of the contributors to the HK Ratgdo firmware.
ratgdo/homekit-ratgdo32: HomeKit firmware for the Ratgdo32-DISCO garage door controller.
my custom driver:
raw.githubusercontent.com/mitchjs/Hubitat/refs/heads/main/Drivers/MJS-Gadgets-Http-RatGDO.groovy
just flash the unit, with the HK firmware... i use DHCP reserved myself, but static should work. then in the HE device driver set the ip address under prefs.