ooh, i love cornbread!
i use extracts for all kinds of things- flax muffins, smoothies, greek yogurt, etc....corn would be a great addition.

BTW, years ago i remember someone on this forum experimenting with a corn bread using baby corn. yes, baby corn is regular corn. but it is very low in carbohydrate. i eat it in stirfries or soups a few times a month to no ill effect, but it is proboally just a 1/2c or so- the rest of the mix i buy is water chesnuts, mushrooms, and bamboo shoots.