I've got 3 nice old coiled cables with AT connectors that I've pulled off old alps boards, if I cut off the AT connector and wire up a USB connector it should work right? The keyboard end has a 4 pin connector with a separate ground, I figure so long as I get the wiring right on both ends I shouldn't have any problems but I'm by no means an electrician so I'd love someone to chime in.
The main motivation for using these cables is that they've cleaned up really nicely and I love the vintage coiled design, also pretty handy already having a 4 pin connector as I that will make wiring my custom boards a lot easier. Will try and get some photos up tomorrow, using my phone and it sucks taking photos at night.