Depending on the radius, you may or may not have luck with a "drop in" replacement from say S&A or something like that..you can for sure re-sensitize the safety to get out of the way sooner. You can also get some thin strips of leather or similar material and build up a bump with some kind of epoxy on the bottom of the grip safety itself, making a nice bump to deactivate it sooner...some pro gunsmiths can braze or weld a bump on too, but it'll probably be less expensive to measure the radius and order something that may/should fit it as a drop-in. Worst case, if you order something from Brownells and it doesn't fit, so long as you haven't modified the part you can always return it..