The simple fix is to install a continuous duty magnetic switch powered by the ACC position on the ignition switch. Those are available up to 100 amps capacity or so, and they resemble a Ford type starter solenoid. The difference is that they're designed to stay engaged for hours at a time. Use about 3-5 amps from the ACC terminal to power the relay, and feed a separate bus bar or fuse panel for high current accessories. That's the fix I used to protect headlight switches on big rigs with dozens of clearance lights.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!