The 360 and "old" one controller also behaves like a HID device on a computer with the drivers installed, that how the network support is implemented. Just my redirecting the HID packages to the WiiU.
Either the driver is just emulating the HID or you have to send a special command via USB, idk.
Even if I would get the bluetooth wokring, we still would only have the same packages as the normal wifi receiver. The packages seems to extreeeeeeeeeeeemly hard to crack/parse/whatever.
Well at least it was a dream for a second there :')