You might be able to do it using one of the recent hybrid Arduinos which have a small PC embedded but a compact computer such as RPi or BeagleBone Black would seem like a more sensible approach. Even so, you will probably end up needing to create your own video adapters to connect between the input and output devices. This strikes me as an extremely advanced project.
Yeah, I'm kinda bummed the project is turning out to be so complicated. The pendant was all I needed to make it work, and it came broken :0. But anyway, the only thing I'm worried about is connecting the video output to the screens. Do you know if connecting those kinds of screens to the RPi using any adapters is even possible?