Thanks for that update, Notes.
Yes, that circuit would work, but the earlier one had me completely confused. It couldn't work.
(I'm qualified in Industrial Electronics and Electronic Instrumentation)
Grounding the unused pickup is how I had expected the circuit to operate.

It's not quite a standard On/Off/On configuration, as there are two isolated connections. A standard standard On/Off/On would have a common connection (3 wires for a single pole switch).


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