Ok. I thought of this in the middle of the night. As long as your quilt is similar to the photo: the blocks are symmetric with the same fabric on the edge, you can make the setting triangles from a strip set. I would cut the first and last strips a tiny bit wider so you have some wiggle room, but I think you don't need to do this. When you cut your triangles, you need to move your ruler so that you have added the additional .7" as you talk about in your last post. Starch the fabric heavily, and I would also stay stitch. Also, cut a sample from newspaper first to make sure this will work!!!! Now I should go back to bed to see if I dream up any more harebrained ideas.
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