In many states you can already do this, it’s called dual credit or dual enrollment, and it’s done through the state colleges and community colleges.
Lots of homeschoolers take advantage of it, and the kids earn their AA and high school diploma at the same time (as the course work at the college counts toward both high school and college.)
In our state you have to pass the college placement test, testing at a certain level in math, reading, and grammar,etc. in order to be admitted to the program.
Our son, and many of his friends, took this route. They never set foot in a high school and received their HS diploma and AA at the same time.
My eldest homeschooled daughter did this (but just for a year). It gave her a lot of credibility at 4-year college application time, that she was taking a full credit load at a community college and had a 4.0 GPA there.
That’s interesting. We homeschool and that’s kind of the plan we have for our boy. He is already a year ahead of his public school peers in most classes. Shouldn’t be too hard to move that up another year between 4th and 10th grad.
So our thought was to graduate him from HS in 10th grade and then send him to a local community college for a couple of years. Then he can make his choice about college.
The one problem I see with that is that we are using the K-12 curriculum. I think by 11th and 12th grade, it’s quite a bit more rigorous than a typical community college. So there would be some sacrifice in educational quality by sending him to a CC. OTOH, he would have a couple of years to slide into college life while living at home.