Rear Disc Brake conversion for WB Van

OK well after getting all my hydraulics right it seems the cables are a challenge... How have people got around this??

I am looking at having the calipers at the back of the discs instead of the front to get the cables away from the leaf springs but that will mean I cant run the standard WB Statesman cables as they will be too short...

any hints???

I am now in this same predicament? Trying to put a WB statesman disc diff in a pano. Do the disc calipers hit the leaf springs???
Any chance of having a park brake still?