Reply to USB Footswitch Shift Modifier

I've been looking to add a single USB footswitch to my set-up. I had a Behringer FCB1010 which, although fully-featured, was too big and complex for my need. I sold it on eBay.

My intention was to use the footswitch as a shift modifier for a newly-acquired Kontrol S4. However, I need to be certain that I can use the switch input as a modifier for another Traktor controller (S4/Midi Fighter). From what I can tell, it may not be possible to pass modifier states across devices. If the S4 footswitch connection is hardwired to the loop recorder, what other options do I have? Would Bome's Midi Translator be any good for this?

Also, why are simple USB footswitches so hard to come by? Surely there's a market for quiet, pedal-style devices using USB (or better still Bluetooth). Damn!