Irenefrie, I just read your post. If it were me, and I was faced with your dilemma I would take a piece of muslin or scrap fabric and cut out the 4 corner pieces using the pattern
and just trim it to the 10 1/2 unfinished. Then I would cut a circle by laying your pieced circle on the muslim and cut one, so it would be identical to your pieced one. Then I would
just follow the direction on inserting the circle. If it is not going to work you can find that out without sacrificing your beautiful circles and good background fabric. Since there are
9 blocks if you just go for it and it does not lay flat like it should, you will never be happy with it. HelenW