By "braded-in", do you mean pressed or staked into the plate? That would make sense...
It does appear to be quite brittle. I might be able to run an end mill over it and then drill it out and put in a similar size pin or screw. but unless I totally disassemble the shutter, it will be fouled with chips and useless...
I think it failed because the inner surfaces of the shutter speed selector ring had tons of black, sticky grease (maybe graphite mixed with grease?) that caused the ring to be very difficult to turn. The torque eventually fatigued the metal and it snapped off. That's my theory anyway...
Damn, another "box it and wait" camera. Wish I would hit the lottery and retire. I have too many back-burner projects piling-up. It gets frustrating when I can't find a sustained period of time to solve some of these more complex repair issues.
The flesh is willing but...