The orange grinding stones are too soft for that. However Dremel has a special grinding bit that you can pick up. I got mine @ WM. Here are some good reasons not to do this:
1) Even if you remove the frown, you'll have to establish a new bevel, on the level with the narrowest part of the blade, therefore you'll need to hone down that part anyways.
2) The speed of the rotation can overheat the edge, thus killing the temper.
3) Sandpaper cuts fast enough not to resort to desperate measures