Yes, if you can get to it. A handheld might be a bit fiddly but provided you use the same value (resistance) for the volume control, there's no reason why you can't.
If you just want an on/off switch, take the battery out and switch the D.C. in lead.
Scratching a break in the P.C.B. track and soldering wires on is another bodge I've used in the past. Make sure your wires cannot pull out and put a drop of nail varnish over the bare copper for insulation.




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