I have come up with a plan so cunning you could stick a tail on it and call it a weasel. I'll make a port and snap-on cover the same size as an IDC plug on the rear of the case. You can then pop off the cover and thread the IDC to D-Sub connector. What I'll also do, is make a little bracket just behind the hole so you can snugly fit a male-male IDC port, that way you could run a short jumper cable from the inner connector to an outer connector, then plug it in with the regular cable without ever having to open the case.