If a person were careful and plugged the openings well, I see no reason why you could not zinc plate with a gold dichromate finish just the bottom without disassembly. You may have to build a jig to hold it perpendicular to the zinc bath. Caswell can set you up with a kit.
Gas cap example:
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70Z28 04B Norwood Forest Green-white Stripes Black DeLuxe Interior
Owned since 1978 - First Car
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