But even with full rudder trim deflection applied inadvertently, the 737 in the ANA incident would never have got to the extreme attitude that happened without some crazy manual flying inputs by the pilot.
I think you negate the role of the autopilot.
During the two left rudder-trim inputs, the autopilot will have been counteracting with aileron - hence the slight opposite right roll to start with. Then the autopilot will go out of limits and disconnect, and so the resulting uncorrected roll rate to the left may well be quite dramatic.