Try straightening it with a hammer and drift punch. It may break off. If it does, drop a ball bearing or two in the hole so the press has something to push on when you extract the remains.
+1, this is better than grinding I think, less chance of marking up the crank. Plus the bend looks to originates below the crank surface, so you'de only end up with a short bent cotter. A few blows from a drift punch will usually snap it off below the crank surface, than you can begin with the press again. If you resort to wacking it with a hammer, be sure to back it up with something so that the BB doesn't take the force of the blow.