Oh, one late addendum to my post: in our state, I think those dual enrollment things only give the child college credit if the class is taught by a college instructor (not a high school one) in a class consisting of a majority of college students. So a special set-up on the grounds of the high school for the high school students would solve the "what to do when you run out of courses" dilemma, but it probably wouldn't earn college credit.
So if you don't want the child in a college classroom at all yet, this might not be the solution for you.
