Back when they were new, you could buy a remote mount for the CB500/550 that moved the ign switch up to the handlebar/top bridge. I had one on my CB500 and it worked great. Stock harness was stretched slightly, but there was enough slack to pull it up OK.
...But due to advancing CRS, I don't recall what it looked like or which two bolts it used to mount the switch...
Anybody got a pic???