I recently got an S&W 5906 that I like. It's a brick to carry, but it's a pretty nice brick. I had Tony at JMCK make me an OWB2 for it using the only mold he has, one for a 6906 (compact version of the 5906). It works well, but it leaves 1/2" of the slide sticking out the bottom. I'm guessing an IWB3 holster would do the same. This would be an occasional carry piece and probably won't get sweated on.
I haven't found another kydex bender with a mold for this 20-years-out-of-production pistol. I could go with leather, but that's a long wait.