Try this. After the second sub meanders onto the court, tell the coach to please have all his players ready to check in at the same time. Then put the ball at the disposal of the shooter regardless of what that coach does.
If he complains, tell him you can't delay the game that much and that's just the way it's going to be from now on. Tell him that if he needs that much time, he should request a timeout.
If he tells you there is no rule that forces him to do so, remind him you have full descretion to rule on unsportsmanlike conduct technicals. In fact, you could "stretch" a rule and say that bench personnel were trying to disconcert the shooter, although usually that rule is interpreted as pertaining to players on the court during a free throw attempt.
If he doesn't like it - tough.
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