I think it would be hard to find a gt2 pulley that allows the toothed side of the belt to be wrapped around it twice. The cable steering is essentially a rope and it can be coiled and manipulated in many directions. But the 6mm or 9mm wide toothed gt2 belts might be more difficult to get to move sideways so as to wrap around a pulley like that. A good example of this is a serpentine belt in a car. Back in the days of v-belts we had pulleys that could be out of alignment with each other because we had multiple belts. But since the outbreak of serpentine belts which are wide and flat all pulleys are on plane with each other. Because the belt doesn't conform or deflect like that without taking major wear.