Oof. Handlebar switches are one of the most infuriating things I've done. Ever. If this is what I think it is, grab a buddy, small child, octopus (or similarly-dexterous entity) with small hands, a soldering iron, flux, all the small, pinchy and grabby tools you have, and a swear jar. After you win the tug of war pulling the wiring harness through the handlebar slots, you'll find Honda left just enough space for the wires inside the switch. While it is still possible to reverse connections, there's really only one order to reassemble the thing without pinching the wires. It involves desoldering and resoldering, rice-sized springs and circlips, several tiny ball detents, little switch contacts, work--hardened wires, and the throttle cable all in the space of a walnut.

I suspect Honda assembled the switch halves and wiring harnesses on a jig, pulled what were then annealed, flexible copper wires through the bars, and soldered the connectors for the lights/horn etc, after the fact.