The sights that C&S uses, if memory serves, are modified versions of the front sight that fits a Beretta. I think the front sight has to be narrowed to match the profile of the slide rib. The rear is a Novak.
They are rounded to keep snagging to a minimum but the back of the front sight is still pretty sharp. It scrapes a small amount of leather out of my Galco USA holster almost every time I draw it.
The glow-in-the-dark paint would probably have a problem with illumination. More than likely you have to hold it under a lamp or other bright light to "charge" the paint. And even then it will just last a little while, not good if it's been in your nightstand drawer for a while.
There is actually radiation transmitted from the tritium night-sights (a small amount), that's it's power source and why it lasts a lot longer transmitting a constant glow.
I think your trying to make a PPK what it isn't. It is a small SD pistol for close range.At close range you don't need night sites.
Its been doing a fine job of SD for many years with out night sites. lazers ot those dumb rails and flashlights It is not a assault pocket pistol. Sorry but people have been getting shot for well over a 100 years with out all this add on.
Practice and then practice somemore with you weapon and it will serve you when you need.
I was just thinking when did you get a real PPK/S List I heard you had a TOY co2 pistol. A lazer slows you down you will actualy be looking for dot and moving it around. A sight is slighty faster. But I just talking to the wall Go play with your air soft.
My girlfriend's oldest son and a friend of his were playing with an air rifle and the friend now has a BB permanently embedded in the palm of his hand. The doc said it would be too much trouble to get it out.