Hi Mark, love the build, I have in the past been able to do temporary repairs on older ribbon cables using the cores from solid conductor cat 5 cable . Soften the cable with a warm air gun, use a pin to create a hole above the conductor, and push the wire in with tweezers, however, this does not work on the newer super thin ribbon cables, but could you buy a ribbon cable connector, cut the cable right through, install it on the cut ends, and plug it back together?
Phil
UK