Put a diverter valve in the output from the head sink drain, and plumb it into the input on the head pump. You can use either a t-fitting, and continue to retain the ability to use salt water to flush, or connect it directly.
I recommend using the t-fitting, since on a longer cruise, it would make sense to flush using seawater in order to conserve your fresh water supply. By turning the diverter valve, it will allow you to flush the head by filling the sink with water. You can fill the sink with anti-freeze and use it to winterize the head, or you can fill it with vinegar to clean the head and help de-mineralize the waste lines once in a while.
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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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Still—DON'T READ THAT POST AGAIN.