[EricH]

I've seen suggestions like this around before, but here goes: Invite this new team to be part of your team for a year or two, then let them split off when they want. They get experience, you get more members for a while. Win-win scenario. Of course, if the other school is in another district, it might not work out.

This works the same as having them "shadow" your team with the difference that they are part of your team.