Well, we might have to agree to disagree on that. The fact you have to hold the thing differently than just about any modern gun out there could be an issue.The gun itself has never been prone to slide bite. If you get bit it's user error. The only way to bleed is by putting your hand where the slide goes. It's REALLY easy to figure out where the slide goes and where to put your hand.
The modern technique is to get your grip on the gun as high as possible. Not really the thing to do with the PPK. There is a whole generation or two of shooters that know nothing else.
Do you want to keep the gun as a museum piece or evolve into something more suitable to the paradigm of today?