IMO, swapping to get rear discs doesn't gain you much even if you are racing the car. For even hard road driving, there is no advantage if your standard brakes are set up well and are in good condition. An extra big negative is that the disc axle takes wheels with a different PCD. Yes you can do a lot of parts swapping at the front to fit the later hubs with matching PCD but it's not just a bolt on. If doing that you might as well go the whole hog and swap to dual circuit brakes. I'd rather not have to carry 2 spare wheels.
Ref the cables, I'm guessing that you might be able to reposition the brackets, or make new ones, where the single front cable meets the yoke for the 2 seperate ones. You will need to use the disc axle cables.
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