Myq, garadget, gates, dilemma

So this is kind of the opposite of the garadget application but I figured I’d ask here…

I have 2 lift master garage doors with myq. I would like to add my sliding driveway gate to the 3rd button on that opener but my gate opener uses a different frequency…

I want to add a myq receiver of some sort so the liftmaster remote works, and I can use the myq app.
Ideally I’d just run a liftmaster gate opener but I already have a opener and the liftmaster units for sliding gates are too expensive.

I am looking at this: Limited-time deal: myQ Chamberlain Smart Garage Control - Wireless Garage Hub and Sensor with Wifi & Bluetooth - Smartphone Controlled, myQ-G0401-ES, White

… But that looks like it interfaces by sending a wireless signal like a remote would (I need a myq receiver that will trigger a relay).

Anyone have suggestions?

I need something like this also. I have a MyQ that will not interface to my opener. I want the MyQ to talk to a Garadget that will close contacts that open the door