Strange enough I had a very similar idea see http://tex.stackexchange.com/questions/83588/latex-mark-up-as-a-generic-mark-up-language http://tex.stackexchange.c

Strange enough I had a very similar idea see http://tex.stackexchange.com/questions/83588/latex-mark-up-as-a-generic-mark-up-language http://tex.stackexchange.com/questions/83588/latex-mark-up-a... and made a prototype. Would be glad to share ideas if you want. Please contact via tex.sx chat.