I forgot to update this. After griping about the grips on my own forum, a friend from there very generously offered to send me a pair of vintage S&W goncalo alves target stocks for the Model 10 that he had in his stash of unused stuff.
What an amazing difference in not only appearance but how the gun fits my hand. It's like a completely new gun. Even the action feels smoother as the gun fits me so much better.