I'd think this would be similar to a false start announced as 'everybody but the center.' You don't walk off 10 5-yard penalties.
10 multiple false-start fouls = 1 foul enforced, so we've got that covered !

I was working a championship game several years ago when, with under a minute to go, a brawl breaks out. Several able-bodied athletic directors were sideline "bouncers" and along with several rent-a-cops

restored law and order while

wrote down numbers. When the smoke had cleared, there were

on the losing team and

on the winning team. Doing the math we were about to send

our ump on a 60 yard journey when the losing coach piped up : " I'm ready to call it a game, if you are ?" ,he inquired to the opposing coach. He ,too, agreed. I applauded and instructed our

ump to merely hold the ball in the air and save his shoe leather. All the fouls were of a disqualifying nature, and that held.
In 2014, I proposed the NCAA version of DBPF's and USC's cancelling even if there was an unequal number of fouls between the teams. That failed on the floor, as the opponents stated that some flagged would go unpunished. In 2015, I again proposed removing the "in order of occurrence" enforcement and to allow such fouls to cancel the equal number of dead ball fouls and enforce any excess fouls.
IMHO, if the fouls require automatic disqualification, the yards need to be stepped off. IMHO, as in the OP, 9-9-5, you have the authority to have one flag with the drama club teammates all being charged with a USC.