I'm in the same boat, except that I have big hands, and Glock Perfection seems to eat webbing between my thumb and index finger. To make matters worse Glock Perfection is perfect for right handed person, not so perfect for a lefty, but close.
So the steam started coming out of my ears when I was thinking , and POW!!!! it hit me. I think rather than buy a cheap glock an goober up the frame, or buy just a frame from glockmeister for $150+ and gooder that up , I am going to practice on>>>>>>>>Drum roll>>>>>>>>>an Airsoft. Yep $25 for a cheap one, and I can grind to my hearts content. After all it's only the grip angle I am concerned about, not the internals. I will keep everyone posted on my progress with pics too.
Matt