I think a better trick might well be to jb weld the sight to something like this:
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Then that goes in the gun. You could never take it off the mirco sight but you could take both out of the dovetail and put something else in later if you wanted.
Seems like a better way to go, considering it's only a ten dollar part.
You could also just use the rear Rossi sight. It's fit pretty snug in the hole and you could drill it in a couple of places and cut it off where the slot for the elevation ramp is.