PCBs are really not very hard to make. You can even buy kits at radio shack really cheap. Adding an NTSC encoder would not be too difficult, easiest way would be to have a connector for one not attached (or make all the needed circuits in your pcb and solder in the required components for onboard encoding), also DIN connector for power. Then you could put it all in something small (encoder mounted inside also) but external psu. Pretty spiffy, maybe i'll make something like this for my next gun. I wonder if radio shack has the stencil thingies needed for SOIC wide 16 ICs so I can use one of the AD725 encoders i've got laying around for a built-in encoder.
I would think a PCB similar to this might be fairly handy for consolisation too.
cheers,
-DT