Rather than mount a switch on the set (which may require making holes) I'd just plug it into a switched power strip and use the strip to turn it on and off.
One possible option is to adapt another switched pot to work. 10K and 20K are common values. You could put a 1W fixed resistor in parallel with the outside terminals to get it close 15K. Or you could add a series 5K resistor to a 10K pot (would reduce the range of the control).
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