Yeah, that could work because of the unusually large amount of unused space in that particular pedal. I'd get one of
THESE switches, set the tang washer for 3 positions (it'll do 4 max.) and wire up just one of the three pole/throw combinations (e.g. pole A and throws 1, 2 and 3). The middle eyelet of the PCB switch location would go to the A pole. Throw 1 would have nothing connected to it. Throw 2 would connect to the outside switch eyelet, and throw 3 would go to the inside switch eyelet. That wiring would give you the treble boost in the first position of the rotary, add mids at the 2nd position, and the bass/full EQ range at the 3rd position.
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