Thanks for the replies... I guess I should have made it clear: this is a 40-1, not an old 40. S&W made a short run of them some time ago; I bought this one new about 10 years ago. And the reason I chose it above all the other J frames available then (or now) is because it doesn't have that damnable lock under the release latch thumb-piece; I suppose the lawyers allowed the grip safety to be an adequate substitute.
As I don't have a curious four year-old at home the grip safety serves no useful purpose. I wouldn't mid it except that the darn thing concentrates recoil into a small area of the hand, which makes shooting this revolver a distinctly more unpleasant experience than it should be. And because, as shown, it stands proud of the grip frame the usual fix for this, replacement grips, is not available.
The whole grip safety assembly (including the hammer block) can be removed without damaging the gun and would be re-installable should the next owner want that useless-to-me function restored. But removing it would leave a large longitudinal slot open in the grip frame which would need to be filled if replacement grips of the cushy rubber kind are to survive firing. I was just hoping someone here had dealt with this and found a solution.