Solder in a wire...if it will clear things. I have to assume it uses a board because of a clearance issue? Running it outside the switch is unsightly but effective 
Or maybe solder in a thin flat strip of copper or brass for modeling . That would increase the amp capabilities. Adding fusing/breakers would protect those traces. MTH would know the max amps it can pass, fuse the switch(or track) lower than that max.
Ribbon wire?
I've always heard it called a "trace" for board work fyi. There are trace repair "kits" and "fluids/compounds", but they really aren't worth a crap. The get-r-done or board swap approaches are best for traces imo.
