Exhibit A:
Ancient Stanley garage door opener from the 1980's, runs -only- on 120v AC.

Exhibit B:
Skylink universal gar. door remote kit. Receiver is designed to wire
into push-button circuit, runs on 12v DC 100mA.

Exhibit C:
Ancient Signalman converter, "for use with telephone".
Input: 117v AC 60Hz 6W, standard male-spade plug.
Output: 12v DC 300 mA

Would it at all be plausible to adapt C to enable B to work with A?
How to wire? Just plug the converter input into wall, splice output
to B receiver?

Thx,
Will