I would use the wire at the cigarette lighter. You can unplug it from the lighter and the harness to get it on the bench, The wire is only about a foot long. Cut strip and solder then cover the connection with heat shrink. I also use this to power relays for light bars and heated grips.
Mine was patched into the wiring to the lighter socket and finally corroded out so I ran a new wire from the battery (with a fuse at the battery end) up to the switch, now it’s powered up all the time which is handy when mounting the winch.