A CPA can start moonlighting during tax prep season to pick up extra income. That’s going to be a bigger help in paying college costs (even after-tax) than gyrating your financial aid status since most colleges won’t care at all about what you qualify for beyond Pell-- since they don’t meet full need and can’t afford to give you what you want financially. For the same hours you’d be taking random college classes, you can be generating cash with a MUCH higher rate of return!
Let your HS kid stay a HS kid. It’s just too hard to get a HS kid enrolled as a degree seeking student- while in HS- to legitimately qualify as a college student.