I have used interrupter brakes with "long pull" calipers. They work. They actually do not pull any cable. They work by pushing the cable housing. Don't ask me how that works cause i still couldn't get my head around the buggers Very insteresting piece of equipment. Somebody with some physics knowledge can maybe clarify how they work in this thread.

PS: Interrupter brakes can also be used as stand alone brake levers. To do this, you insert the brake cable from the other end. And in this kind of use, they actually pull the cable when you actuate them.