What we installers would do is to determine which two terminals in that port must be connected together, or must have a voltage applied to them, to raise or lower the lift.

(The reason I said it's important to know whether raised or lowered is the "put away" mode is so that the description makes sense.)

That is, apply a voltage (or connect together) the right two wires, when the thing is plugged into the wall, and the lift should come out of its housing. Disconnect those wires and it goes back in.

After we determined that, we'd get something like the Xantech CC12 IR-controlled switch, and program the CLOSE and OPEN codes into the remote control. The MX980 is ideal for this.
That's why we keep coming back to this port as your answer -- we provide the external switch.

By the way, I've sent a strongly worded message to the parent company of these jokers, indicating that their company is being bashed on an international forum, and that they deserve it. Help might actually be on the way.