Since most wiring on the Wing is set up for "plug and play", it would seem to me that you would need some type of "jumper" wires to relocate the switch. That may prove to be a challange. If you attempt it, let us know how you make out...
If you dropped the key when you were going to unlock the gas door thing. Try what I've done have a spare key made and get yourself a radio knob for a Gold Wing, I got a chrome one. Then cut the key so there is about 1/8 inch of key sticking out the lock on the fuel door. Then J B weld the key into the new knob. Be sure it will unlock the door. If done right this key will not work in the ignition, because the slot in the knob is recessed and will fit down over the fuel door lock but the ignition ring is flat and the knob will not let the key fit into the ignition switch enough to let it turn.
I've done the same for the right fairing pocket and leave both on the bike at all times.
Just an idea.
From the Northwest Corner
To get the right length. put the key in the lock and mark it for the right depth and cut it a little long then file, grind or cut your way down to the right lenght at the top so it is just touching inside the top of the slot. And glue is place.
Let me know how it works for.
From the Northwest Corner.