Stanford has an online program, too.
Another possible option would be to look at which cybercharters operate in your region-- that has the advantage of being both fully accredited and free.
You'd just have to convince them that your DS can MORE than manage an overload for credit recovery purposes.
That might even be a means of getting AP courses onto a transcript, which would be helpful in terms of college admission.
As far as I know, most colleges and universities don't really consider MOOC participation or completion as anything but an extracurricular-- like chess or piano, for example, or maybe robotics.
