It sounds like you've decided to leave as is. It sure is a pretty quilt!
I have a thought in relation to undoing when you have prairie points. You could probably fold the fabric back and stitch just the prairie points within the seam allowance. That way, you'd have a strip of them left, rather than individuals pieces, when you remove the borders.
I'd love to see how it all works out. If you can, please post a picture when done. :)