Allow USB tethering connections directly into the router.

The only source of internet I have available to me now is via a tethered connection from my 4G plan on a tablet that is always tethered to my main PC. Unfortunately, as I need to bridge connections between my tether and NIC in order to share on the network, the PC with the bridge is unable to access or be accessed on the other computers on the network. I would love to see a router that has a USB able to accept a tethered connection instead of just for a NAS, for ease of sharing internet across the network and to regain full network access.