If you're buying new switches, then use Atlas track with ROSS switches. You can buy them wired with DZ1000s and just rig the motors up for anti-derail.
But you dont need a switch machine, you can spring the switch to operate as a reversing switch. The spring out of a click pen is enough to hold the switch closed, but light enough that it'll let the points move if a wheel tries to push on it. Loop the spring through the hole in the throw bar, and connect the other end to a screw or nail run into the layout base. Just have to find the right tension on the spring to keep the points closed.
