If you really want to stick with the pronto, then your best solution (and cheapest) is stick with IR. However, I would recommend checking out Xantech. They make great little IR extending systems that work well and are affordable. You would only need an IR receiving bud (in wallplate form) at the front of the room, a Xantech Repeater (power supply), and an IR Blaster at the switch locations.
This solution would also work for racks in long hallways... wink wink.
Hope this helps.