The simplest solution to increase current is a small 12V Bosch sealed relay. This will allow the headlight to draw current directly from the battery, while keeping the functionality identical to the factory configuration.
I would be a little worried about the wiring, but the switch would be a larger concern (20 Amps is a lot through the light switch).
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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