You could use MMB but prepare for that not to work particularly if it is close to depature.
Seriously though, do you dislike VAA staff - if you call them it could be added within 2-3 minutes. Or you could live chat with one of their reps online. There 24/7/365? Forgive me for being nosy; but why are you so adverse to picking up the phone for a few minutes or talking to a rep at the airport if you can't phone?
Have a great flight
