I really like this approach (even if I'm still not entirely convinced about the benefits of dotsies).
For a while, I've had this idea of a book that starts in standard English, and gradually alters the grammar and introduces new words - so that halfway-through it's written in somewhat of a pidgin/creole language, and by the end you're reading a completely different language (e.g. French or Japanese). I'm not aware of such a thing existing, or even being feasible for that matter, but I think it would be interesting.