consider this. When looking at the whole quilt while it is being used to cuddle under or as a bed quilt laying on a bed. Will it really show as a flaw?
Can the outside blocks be removed and re made?
I would only think it would be a true problem if this were going to entered in a show.
Some times, what is done is done and we love our kids anyway. Hope a solution is found for your dilemma.
peace
EDIT: The flange idea is a good solution as it will cover part of the quilt block.