E46 Pre-facelift LCM to Body Module Wiring Issue

I've done a temp fix for the time being but I'd like to eventually do a full fix. So here's what I've got. One of the wires or the connection at the body module went bad going from the body module to the LCM resulting in only about half of the exterior lights working. After doing a lot of playing around I decided to just say "Fuck It" and slap a butt connector from the working wire to the other wire chopping non working end off and sealing it (This will work for quite a long time as I have swapped every bulb on the interior and exterior with LEDs resulting in significantly lower resistance and power demand.) That said, again I would like to go in and do a proper fix sometime later on down the road. Will I need a whole new body harness or should I just get a piece of wire with some molex ends on it and pop the old wire out and new wire in?