Though Ciment, the group in power before Rizzuto (Cotroni, Violi, etc.) weren't Sicilians but they were closer than the Rizzutos to New York / The Bonannos.
I wonder if anyone left in Montreal is close to Cali and the current Gambino, Sicilian leafership group. That would be a better alliance than the Bonannos.
However true that the Cotroni's had close ties to the Bonanno's at one point, the MTL Sicilian clan always did have blood relations with some of the NY members. The likelihood of any future relationship may come from the Sicilian clan but anything is possible.