Assume your taper, (in your handle material) and pin match exactly down to the original pin hole in the liner, and your material is a hard stone that can not tolerate pressure. Let's say quartz crystal. Setting (gluing) the stone, and inserting the pin thru the handle into the liner to be silver soldered "could" be the easiest, and dare I, best way to set a brittle material. Maybe?
I guess my question would be; Why do you want to use a material that cannot tolerate pressure as a knife handle? The first time it gets dropped on a hard surface the pressure created from the shock of the drop will break the handle.
Why would you go to the extra time and effort, (which in manufacturing equals money), to use such a fragile material that the knife could never be an EDC?
A knife like that would be a safe queen only. If you you’re making a safe queen just glue the handles on and don’t worry about pinning them.
If you really believe that method will work the best, then do it, but unless you are going to use this method then this has only been an exercise in mental gymnastics! All the what if this, and what if that questions are fine and dandy if you are going to using those methods, such as tapered pins for handles. But if you’re not going to use those methods it’s a waste of time for everyone.
Cutler’s have been using round pins for hundreds of years and they work perfectly well.
Why beat your head against the wall to reinvent a more costly wheel that may or may not work?
Especially when it will likely be cost prohibitive from a manufacturing standpoint?
It doesn't make sense to me.