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There are a lot of different vane designs, some use trim tabs, some use auxiliary rudders, some require neither, and some use a servo pendulum blade. You're right in that if he doesn't already have the wind vane, he'd probably be better off getting one that doesn't require a trim tab—ideally, he should get one that doesn't require an auxiliary rudder or pendulum servo blade either, since either would cause problems with grounding in some situations.
However, the trim tab, servo pendulum blade and rudders are generally required for a wind vane to generate sufficient turning force to counter the helm on some boats. If his sharpie doesn't have high helm loads, he might be able to get away with a simple wind vane, that doesn't require the amplification of a trim tab, servo or aux rudder.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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