I was looking at the design after seeing this thread - for the record I haven't had an issue with my pin yet. What do you think of this idea? Drilling a small hole on the right side of the frame that is smaller than the end of the pin, but large enough to get a small punch or other tool in. This way the pin head doesn't have to be pried on for removal it can simply be pushed out from the right side. I have always felt funny about prying against the frame for take down anyway. The hole would be through the polymer and actually would only consist of enlarging the tiny hole that is there now and continuing it through the side just a bit (if you look at your Elsie you will see what I mean).
There is currently NO hole in the LCP's polymer frame at the right end of the takedown pin channel. There is a pin-diameter hole in each side of the aluminum sub-frame and on the right side of the LCP that hole peeks over the top of the polymer frame. All you might want to do is cut a very small notch in the top edge of the polymer frame.
Using a drill would be the wrong thing to do. In addition, using
any cutting tool that goes through the hole in the sub-frame would probably be risking damaging the hole in the sub-frame. The best way to deal with the modification without damaging anything would be to completely remove the sub-frame after marking where the notch should be and then file a smooth notch into the polymer frame.
There is one reason that I would not do this mod at all, though. That's because a notch in the polymer frame could weaken the frame and cause it to crack when under the stress of firing the LCP.