What I have done is position the operating switches either side of the baseboard joint (in the centre of the layout so to speak) so that one doesn’t have to connect/disconnect anything when assembling/dismantling. I use small slide switches with a hole drilled in the operating ‘knob’ with a small piece of copper tube on the wire either side which is then soldered to the wire at the required position. Clip your turnout so that the switch will be in the ‘push’ position and with the wire fitted to the stretcher bar; solder the copper tube against the switch ‘knob’. Next unclip the turnout and clip it the other way; slip another piece of copper tube on the wire, push the switch ‘back’ slightly and solder the tube against the other side of the switch knob. A small dab with the soldering iron is usually all that is needed and the ‘frog’ polarity can then be wired through the switch.
Easier to do than write about it!