Hi, I was a product developer for AMD many years ago, and I could certainly help you spec' this prototype. It sounds like your looking at Bluetooth connectivity, with some firmware APIs.
My quote is wooly at best, I don't think we could build this (as a one-off) for less than 3k, as the software architecture would need developing, but I could certainly build you a coherent wireframe document, letting you know how / where and how much for, the core elements could be sourced.
If you would like to chat further, let me know, but please elaborate on the USB interface, I get a little lost at that point.
Best regards