I think all the girls should just be sterilized some time before they can breed, then after they're in a stable relationship and everything's peachy and they've both done the course, then she gets unsterilized and they can have a baby. Gatica style.
Or even stepford wives?
I know it's a serious subject, but I'm just not sure if there's an answer. Moving a child to a different school is a big step, and chances are, if their attitude or behaviour doesn't change, they'll probably still have the same issues to deal with. Kids have a pecking order as do most other social groups. Not sure what the answer is, but I can only go on personal experience with my own kids, and that has been that a bully will keep going till he finds out the hard way that you've had enough.