how to convert lightning to composite

So i own a pair of MyVu Video glasses http://www.amazon.com/Myvu-Personal-Viewer-Edition-MA-0495/dp/B000W9OJVA and on my old ipod touch 4th gen with the 30pin connector i just got and adapter to use it on the glasses. but now seeing as the lightning port doesn't have a analog composite output i was wonder what would be the best method of a compact lightning to composite convert that i can use on the go. if i cant find one i guess ill have to make one.