I love this approach. What sort of safety nets would be needed to catch students, early on, who struggle academically but may not qualify for a 504 or IEP? One thing a private high school does (Maur Hill-Mount Academy) is to have Independent Learning Time (ILT). For sophomores-seniors, this time is relatively unstructured, so long as their grades are high enough. For freshman students and those with lower grades, it is more structured. A key component for ILT is that the teachers are available to meet with students in the teachers' common offices. A key difference with micro-credential system would seem to be establishing at what point does a teacher or staff-member intervene.