I'd grind down the spine, as Bill said.
I'd use a wide, flat, fine, file, with very light strokes, followed by a stone, then 400 grit SiC paper, then a polishing compound on a hard surface.
The alternative, regrinding the edge, is WAY more risky, since you have to hold the proper angles around the curve of the blade...very difficult with a hand stone.
A Dremel tool will be worse yet, it's very dificult to grind a controlled line with a Dremel.
Grinding down the spine can be easily done.
Just make sure to 'extend the curve' of the spine so that your re-grind blends smoothly with the blade shape.