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I've thought about this myself. I think the first thing to do would be to find a switched low voltage source inside the box. Then, find a schematic for any '80's/'90's remote TV and look at it's relay driver circuit and build something from that. There shouldn't be that many parts involved. Usually a relay, the driver transistor, and a shunt diode across the relay coil. If there's not enough room on the rear of the box to mount an AC receptical, you could run and securely mount a pigtail from an extension cord and have it running out of the rear of the box. This would be a good idea in order to make our older TV's fully remote controllable.
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