Both pilot & Airline have a duty of care to their fare-paying passengers, accepting a person who has not been vetted or approved by Ops on the flightdeck is an unacceptable risk. The armourplated flightdeck to cabin door and surveillance cameras aren't there for decoration. The procedures in place to prevent unauthorised entry in flight are there for valid reasons. The whole concept of extracrew is the antithesis of good security practice
