Welcome! And I'm sorry for your troubles with the school. It's so hard, isn't it?
I am curious about why homeschooling isn't possible for you, though I don't want to pry. May I assume it's because you work? I only ask because many people rule out homeschooling without really knowing anything about it. I know I did!
Before I shut up about it (and I promise I will very quickly!), I'll just add that HSing does not have to be 8 hours of school-at-home. Many people dismiss it as an option because that's what they think it is. (If it were, most of the HSers I know wouldn't be HSing, including me!) Last year we spent about 3 hours a day on school with DS7, and that included clean-up time. With a bright kid who loves to learn, it's pretty easy to get through school stuff fast. Also remember that you can get childcare during the day if you need some time for work or alone time.
Okay, done now!
I just like to make sure that people don't rule out a workable option because of a misunderstanding. But I promise not to be (too) annoying about it.
Many people here on the forum have their kids in public school and then afterschool to keep the kids challenged. It can be a bit hard on the child sometimes, I think, since they're in school all day, bored and learning next-to-nothing, and then they come home and Mom asks them to think. But for kids who are desperate to learn, it can make an intolerable situation much happier.
Switching gears to a totally different option...Is it possible to find a play-based, half-day preschool program for this coming year and then spend the other half of the day working with your child? Again, if you need the full-day pre-K for the child care so that you can work, then that is probably not a tenable solution. But if work isn't the problem, then this might make the coming year go better. Full-day academic pre-K programs can be just awful for HG+ kids. But a play-based pre-K that allows the child time to explore his/her interests can work very nicely.
FWIW, our HG+ kid did fine with play-based, half-day pre-K and K programs. We ran into trouble (BIG trouble!) when we hit the full-day, academic 1st grade year. Personally, I wouldn't recommend rushing into a highly academic program unless you know that your child will receive good accomodations in it. Often that sort of program spells misery for an HG+ child.
hth!
K-
