I'm somewhat weary of calling a personal foul on a bench player, although the intentional would be the best way to go about this (3 shots for a 3 point attempt).
I would probably pull a DeNucci
and call two technical fouls on the bench player - one for entering the court without authorization; one for contact with a player. This way, you have 4 FTs for anyone on team A, B6 is ejected, B coach has 2 indirects toward his count.