Oneeye,
This is such a brilliant and clear-headed solution. I'm so proud that you're taking this step. I don't think it can hurt. As cece pointed out, they probably aren't under any obligation, but hey you'll be no worse off than you were before, if they just choose to ignore the request. Don't attach any expectations to it, and don't threaten (doesn't sound like you are) but I have a good feeling that at least some of it will be repaid, if you're businesslike and kind about it, and if you point out what you would like to do with the money (improve your life in some way perhaps).
Way to go!!!!!!!!!!!
GL