My Ishoot L-bracket that I've been using for years didn't fit so well on the KP and grip. I had to hang it off the wrong side to use it at all. Now the vertical plate rests in my hand when I grip the camera. Not ideal, but I could work with it. That Three Legged Thing grip might work, but it's pretty expensive for what it is. I wonder if the shorter one might work better, since I only need access to the microphone port to plug in my remote shutter release. I found a much cheaper alternative on Adorama:
https://www.adorama.com/ulz1132.html?=adl-gbase
Seriously, what's the difference, except price? For $11, it's basically the same design without the high price. I'll post an update when I receive it to see how it fits. It looks from the measurements like it will be just under the mic door when it's installed. That would be perfect.