Ok, I was in a rush with that last holster attempt and didn't fully commit to the process. I tried to wear it for an hour yesterday and it was pretty terrible. So I went ahead and started a holster from scratch.
Here's what I came up with. It's a scabbard design held together using one larger rivet and using two grip clips as attachment points onto the waistband. It's molded so that the gun is locked in if tried to draw straight up. To draw smoothly the gun must be pulled out to an angle instead of straight up. Here it is.
Just for fun I wore it for over 3 hours to dinner along with my S&W 469 both up front at centerline carry. I was surprised it was pretty comfortable even though I'm not used to carrying at the 11:00-11:30 position.
I know it looks funny, but it worked with a sweater over it. During most of the year I don't usually go about without a belt on so I don't intend on using this holster all that often. It is the best option I have for my Kahr when belt-less so I'm glad I have it in my holster stable.
Here's a picture with it worn without a belt as it's intended.
Here's a short video showing the holster in action: