Help with bitmap motion/shape tween

I have a book i’m attempting to animate. The cover opens and the problem is I need to distort the bitmap in order to make the animation completely realistic. Obviously, I could do a (size costly) frame by frame version, but I’m not too thrilled about that. I can obviously do a motion tween with scaling and the book cover closes fine. Problem is that with perspective, I need the height of the cover’s edge to get larger as it approaches the 90 degree angle point. Get what I’m saying? How can I apply a tween that will allow me to scale AND distort the bitmap while retaining a good, clean tween on the bitmap (without unwanted affects)?