Dan,
Have you seen the Kahr E9 grips? They are made of the hard plastic just as the Kahr MK9 and Cover 40 grips. The E9 is the econo version of the K9 (cheap finish, non dove tailed front sight, non Hogue rubber grips). I too prefer non rubber grips because on me they hang up on my jacket upon drawing the pistol. I had a Hogue Handall on my Glock 19 but I took off because of this reason, but I went with the 'skate board tape' sides on it. Kahr should be willing to sell you the E9 grips. You can find their email address at their website
www.kahr.com
Robb