This is what my luthier did when my cello bridge for whatever reason was failing at the point of contact with the A string. As a temp measure, he inlaid a piece of ebony, then glued parchment over that to be kind to the string. It worked beautifully, and still going strong a year later. It looks a little weird, but if it ain't broke...
I recall he said that such a measure is often taken for violin and violas, because they have tiny little cruel strings.
