I think supporting your child in the charter school program is going to be harder than you think. My son goes to an excellent public school and it takes a lot of effort to help with math homework, English papers and other long term projects. I can't imagine how much more effort it would take to also have to teach time management and project management and supervise schoolwork those extra days of the week, a lot of that being self-taught by necessity. And I'm a teacher! My son needs the structure of a daily school routine.
That being said, if the child is extraordinarily organized and self-motivated and is not currently having academic difficulties, it could work.
I just remember growing up JW that I was sooo thankful to be able to go to school every day, even with the occasional bully here and there.