What about an inverter?
Find a small one that has the switch, the 110VAC outlet receptacles, the fan, and the fuse all facing one side, with the 12VDC input on the other. The input side can be inside the console, directly connected to your power and ground.
In fact, the fuse and the fan can be on the inside of the console as well, because there is enough wasted space under there for sufficient airflow.
So really, all you need on the front face (to replace the face of your old RSA control head) is the 110VAC outlet plugs and a switch... and perhaps a couple of LED indicator lights.
