Have you seen the way I destroy threads with unrelated tangents? Please, keep it coming haha. I find these Sicilian mafia families based outside of Sicily incredibly interesting and relevant to Tunis.
What stands out to me about what you've said about the Neapolitans who joined Cosa Nostra, is the US mafia appears to have done something similar between 1915-1931. They didn't merge into "hybrid organizations", but men affiliated with mainland groups in the early US received separate recognition as Cosa Nostra members, which ended up displacing their previous group for various reasons.
The difference is with the members living in Naples, there was no displacing the Camorra as it is all around them, so they maintainted their Camorra identity and could go back to it. However, if that's true I wonder what kind of decision Cosa Nostra made. You can't unmake someone, so I wonder if they officially shelved them or if they did nothing and just let the relationships wither.