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In a regular old gearbox, the switch directly closes the circuit to the motor, and is mechanically disconnected by the cutoff lever after one cycle.
With an electronic control, a microswitch controls a mosfet which closes the circuit to the motor. The cycle is generally stopped by a sensor that either monitors the cutoff lobe on the sector gear, or a switch that gets actuated by the cutoff lever.
The selector switch position is also monitored by switches or sensors.
So if you don't mind desoldering stuff from a board, or soldering wires onto a board, then you could absolutely move a switch and a selector anywhere in a gun from an electronic control unit.
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