I would have to guess that this would work... But remember you'd need to stay right next to each other, so that poses a potential problem.
Also, RAF only goes to 60, just in case you forgot.
Hopefully someone else can confirm/deny whether you get 3x xp for BGs, although I'm guessing you do.
Edit: Questing with RAF is also insanely quick.. so it may not be any faster or even worth it to level through BGs.