OMG.....you brought out memories from last year. The kids kept picking on me all season last years after I made the same mistake and I still tease them and put this quilt every year on a different table. Here it is....and of course this year I have a small nativity on it
Anyways back to the solution. I did that on few blocks last week just carefully removed the stitches and the took out the blocks fixed them and sewed them back....doable really but with attention.
Good luck