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The LMC truck headlight wiring harness is an easy fix as it removes the current that runs through the switch through a remote relay instead. There are others that fabbed up a harness as well with heavier gauge wiring.
No cutting of existing wiring. Plugs into existing headlight bulb plug on one side, then connect to battery positive and ground. Other existing headlight plug gets disconnected and not used. Harness has "new" plugs, controlled by the relay.
Quick, easy, and rather foolproof.
You can assemble a functional equivalent for less, but without the "bulb plug" in the harness, you'll have to cut into the light wiring on both sides.