as far as 'easy', that would be a simple tee fitting in one line for the original-style brake pressure switch like this. Iff fittings on each end and 1/8" npt off the center branch for the switch.
If you plan to fit a proportioning valve, there are versions that combine a distribution block, prop valve, and brake switch like this, or another version like this. Hth
Yes.OK here's an idea, please let me know if this will or will not work.
If i use the same junction block that was bolted to the front of the frame, remove the rear circuit from it and extend that direct to the new MC (front port) and extend the now isolated front circuit pipe up to the MC (rear port), but instead of blocking off the empty port in the junction box i could just fix in a 3/8"-24 hydraulic switch which is a common size over here, could it really be that simple??
PS: ... "distribution block". If it has valves or gizmos in it, then "combination valve".