you set your parking brake all the time right? why not just have a relay open the charge circuit and isolate it while winching?
LOL
Maybe my post was unclear but I suggested the same thing.
But use a Master "ON" switch local to the winch.
Active/ Passive circuit.
To use the winch you are forced to turn it "ON". However at the same time it disconnects the charging circuit.
Hell, for that matter you could just wire the charging circuit to open when either "IN" or "OUT" button was used for the winch and "dummy proof" the whole mess.
Nothing to turn "ON" / "OFF, no parking brake to set, no charging circuit to unplug/plug.