Looking for suggestions for dual-mod cables

I’m modding a pair of Namcos to add the Paewang Revolution PCAs in and thus make them PS3/360/PS2 compatible. This means I need to either run two cables out, make or find some dual-purpose cables, or add in a nine-pin connector of some variety (1 Vcc + 1 Gnd + 5 PS2 + 2 USB = 9) to let me swap the cables over when necessary.

Does anyone know where I can cheaply get ready-made PS2+USB cables (perhaps from crap multi-console sticks that have been ripped apart prior), or failing that does anyone have any good suggestions for a nine-or-higher-pin connector other than a DE9 or 9-pin mini-DIN?