Actually, it probably would be easy. Simply remove the center wire from the switch motor; you leave leave it hanging.. If you use the 022 controllers, simply disconnect the middle wire from the 3-conductor running to the switch motor, and run a wire to it from the transformer grounds. A single wire from the transformer ground (usually "U") can feed all of your controllers.
This eliminates the voltage loss, not only from the length of wire, but also from the train which is drawing current through the outer rail feed and the outer rails.
I should add: What size wire is feeding the outside rails, and do you have frequent drops to feed the outside rails?
