It won't have quite the same look, but maybe you could do a really narrow sashing in between the blocks, and sew it at 1/8 inch, that way the points that don't quite match up won't show, and you'll chop off les of the points that you had to square up....
I know it's a pain to unpick all those blocks, but it might make you much happier with your quilt, and you'll be more satisfied to auction it off?
Just a suggestion, I don't really have any other ideas.
And to be honest with you, I don't think it's as bad as you make it sound. Mcdaniel is right, only an experienced quilter would see the difference. Plus the person who wins that auction will be thrilled to have it.