I would imagine that you could solder the wire again, I just bought a 4 buck switch from supercheap, and mounted it in the dash I drilled a hole in the removable pushout panel thing, its just a simple on off switch,
I cbf running the wire through the firewall so i ran it next to the loom that follows the strut and continues to the wiper motor, then into the gaurd and the door, i know crap way of doing it but it works, BTW heres a pic or two!