Someone smarter than me can answer as to whether there is enough metal for a cocker detent.
Wedgits would scare me with a cool finish like that.
Might want to think about the palmer detents - the ones that are a plastic ball and C-shaped spring. PPS uses them to prevent double feeds, but you might be able to move one a bit forward to prevent rollouts. You would have to drill a hole in the breach/barrel, and a small hole in the solder between the barrel and feedtube, but you wouldn't have to worry about tapping or threading anything.