That's the best route I had up to the time this one broke. It was a 1/16 pin made from a broken drill bit. The JB Weld gave out. I may have the pin around in my shooting box somewhere. I drilled mine all the way through because there was no other option - very little metal at that point on the Pocket Police frame. I did de-grease the hole as you mention, but no dice after 10 shots.
I even had used a drill press to make Slix-Shot style vented nipples (also no help).
The whole thing was frustrating. I actually have not shot that revolver since, even though it's a fun shooter when it isn't pulling caps right into the action (which is about as often as not). My Navies are much better.
Maybe the metal putty is next, using the same method described above de-greasing the hole and setting a 1/16 wire pin. If that fails, then maybe only brazing can fix this.