Call me strange, but I love the stock Kahr gripping surface of the PM9 and P380. I'm curious to hear your feedback on this. If the sleeve is tight enough to cause the CT to activate, I would carefully mark the spot and use a hole puncher on the grip as a first pass at a fix. I've shredded Pachmayr grips trying to install them in the past so I would be very reluctant to cut out a section that left any loose ends as the gripper material will tear quite easily. A round cut out, with no loose ends, should be fine. It will be interesting to see if the grip will end up being too thick and not allow you to activate the laser even though you've removed a section covering the laser switch.
Let us know how you make out.