hihi

It would be so easy to route a few power lines and data pairs from the chipset's root hub(s) along with the display power/data, and expose them through some kind of low-profile connector along the hinge side of the lid. It could even be an FPC with some well-labeled, HASL-tinned (or ENIG, if you're feeling fancy) pads, covered by a protective film. Peel the film off, solder on your USB-based hardware, attach it to the lid with your adhesive of choice, and Bob's your uncle!