katie, i think that would work in recreating the coconut flavor and the tang of buttermilk . i guess we both know that you can use regular milk and vinegar to approximate buttermilk (but i am wondering if cider vinegar, which is less acid than white vinegar, wiould not work as well as white vinegar.)I don't THINK the thinness of your idea would be a drawback but if someone says it would, then i would recommend sub'ing plain yoghurt, sour cream or regular buttermilk.
http://food52.com/recipes/24669-cultured-coconut-milk-cornbread
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http://food52.com/recipes/24669-cultured-coconut-milk-cornbread