One possibility, might not be worth the effort, would be to put a step down transformer to drop it from 20v to 16v on the fixed output. I may be wrong (son of an EE, black sheep) if you put the ground on 6v and the hot path on the 20v fixed, wouldn't that give you 14v relative (and please don't try this unless someone else said it was okay), since ground and hot are relative voltages?
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