That's the rub with acceleration. It's usually better than languishing in a totally inappropriate class, but it can present other, new problems which have to be sorted out. My own kids are PG and would have trouble fitting into a typical age/grade placement, but they are asynchronous too, and would have to either be stuck at a lower level of academics, or pushed into a situation where they could not keep up with writing requirements.
Homeschooling solves all these niggling issues for us. We have other challenges though, such as Mom having to work hard to get a break, and will the house ever be really clean?
good luck with your discussions!