Looking at your schematic, it seems that pin 4 and pin 9 act like a trigger to identify the cable. If we could only find the connector through mouser or digikey...
One thing that I have done to help keep the cable in good health was to encase the plug (minus connector) in a resin block. When I first plugged the cable into my nook, I was uncomfortable with the stress that the cable was under if the nook was resting a flat surface. I made sure that the block brought the connector up to the same level as the nook's connector (no more stress at the port ^.^), as well as reinforce the exterior of the plug.