We've been able to do AP for DC20 and DC17 during the high school years (with college credit for the exams), but I did the community college route when I was younger. It's possible, and I very much enjoyed my time as a young college student (albeit, not enrolled full-time due to laws about matriculation). It was easier to enroll in community college with ACT/SAT scores (higher than the school's average) and taking placement exams there than it would have been without the data, as the college was wary of taking a young student for core classes. Bringing them when you approach the administration, as well as maybe letting professors in classes of interest meet your daughters and see their interest in the material, may help you obtain permission to enroll.