Kinda stole this from an episode of 'The Wire.' Always thought that if worked right, it could work brillianlty.
Basically your wing walks up to a set (3 maximum,) either acting drunk or actually drunk . He should be acting obnoxiously and offensive to the set but not too offensive as to cause a scene.
When the set appears to be annoyed you walk in and escort your wing away (not too far so that you're away from the set.) You then go back to the set. Apologise for your friend's behaviour then allowing you to escalate conversation further...
Me and a friend are going to give this a run through soon to see how it works. Any input/critique on this would be appreciated.