Trivia: Admirals Clubs never have had a restriction on outside food. Delta Sky Clubs and United Clubs both do.
Can confirm having had multiple sushi dinners inside the CLT C club.
Cupcakes are likely the best bet if in the air. Or, as was mentioned above, rent a conference room. The AC team is Boston are phenomenal.
Or, as also mentioned above, fly EK F and party in the bar area
