I agree that the factory round-butt grips are a killer. I have also been unable to find any after-market grips for mine (I have a .45 LC/ACP).
I have though, discovered that regular Redhawk grips fit and work just fine. I was also at the point of giving up and moving on, but I decided to try a set of Pachmeyr Grippers on it. They work great! I now really enjoy shooting it.
Yes, you give up the round grip, but in return I have gained a lot of pleasure and satisfaction shooting it since I installed them. It was more than worth it to me.
With more round butt guns being released, perhaps someone will put out "proper" round butt Redhawk grips, but in the meantime I am happy with this solution.