Customize boot2docker.iso to use wireless devices on containers (Docker-toolbox)
Okay, so I may need to do a little more research to fully grasp your question here. But from my understanding you're essentially trying to create a container network that is bound to a custom network interface (your USB wireless interface)? If so, we have documentation on how to create a container network that's bound to a specific network interface here. Have you tried that approach? Basically you should be able to use the option, -o com.docker.network.windowsshim.interface=<Interface> with the docker network create command to specify which host interface your new network should use. You can then attach your containers to the network that is bound to the correct interface, then you should have connectivity.
I haven't had time to try it, so take this with a grain of salt, but this guide recommends Docker Machine and that makes sense to me.