Equally you may want to beware the law of unintended consequences. If you push the line that once in always in down to aircraft type then that encourages very very strongly the outsourcing of all work on the 787.
I would be surprised if they haven't already sold their employees out on this one already.
Not sure if I agree on your interpretation of the interpretation. Sure Qantas will run that line though. Knowing the history and purpose of the clause makes it a little easier for me.