Hello. I don't think it's feasible in the HP as the magazine's length limits cartridge length. I believe that the late George C. Nonte did something along these lines with the HP a 20 years ago using the .38 Super, but wound up having to seat the bullet so deeply that no real gains were made. For what it's worth, I'd love a HP in 9x23!
I suspect that for the same reasons, this wouldn't work well in the CZ75 9mm-sized handguns, either. I suspect that the magazines and therefore the grips would have to be a bit longer to get this.
The gunsmiths on the board may be able to add guidance and the feasibility of your idea.