Got a virtual machine working with bluetooth by using VMWare Player rather than VirtualBox. Still kinda wonky on the connection though. Just bought a $30 Digiland Android tablet, heaps easier!
I remembered that Android-IA 4.2.2 has working WiFi on the Surface Pro.
But I can't find the source for it, only the install files.
We can try to get the WiFi driver from it for the 4.4.