No, because all (most?) heelpieces are on a track. For example, new holes could be made 1cm back, and you can slide the heelpiece 1cm forward. This will change the flex an unnoticeable amount, but I remounted one of my heelpieces myself and I don't notice a thing. Helicoils are great, but I think fresh holes will hold up better.
Bromance Crew, since '08