PD Clutch is absolutely great with my K-3 III. Better security and better comfort (weight distribution) than wrist straps when I carry the camera one-handed, and easier/faster to get into the shooting position too, even though I'm a two-handed shooter.
PD Clutch on KP is a different story. My index finger doesn't naturally reach the shutter button which is placed like classic film cameras (i.e. mounted on the top plate, facing up, rather than on a grip, slightly tilted forward). I have to contort/flex my index finger back towards thumb slightly. I get used to it after a while but that doesn't mean it's great. I stopped using Clutch for KP because of that.
There must be a hand strap designed with "classic" shutter button placement in mind, it's not just KP after all, Fuji cameras are similar, but I haven't found one.
Peak Design released a new product called Micro Clutch on kickstarter, probably just for this very reason. Index finger isn't constrained by the strap and is positioned slightly higher (compared with the Clutch), both of which should help the access to the shutter button, it seems.
https://www.kickstarter.com/projects/peak-design/micro-clutch-hand-strap-for...=peak%20design
It's good that they recognize that the Clutch design is not great for some cameras and designed a new product. However, I found the idea of a bottom plate that covers the battery door very unattractive. Even if it's super easy to remove the plate as they say, if I need a tool to do it, that's already inconvenient. And KP battery cannot be charged inside the camera.