You may want to look for a cf ethernet adapter instead.
The biggest con is you lose your cf slot, but all of the mini usb ethernet adapters that google turned up seemed to have drivers for desktop/laptop version of windows and not windows mobile.
But, people have used cf ethernet adapters before and they have wm drivers.
According to
this post, this is one of the only ones avaliable:
Socket Mobile 10/100 Ethernet CF Card
It has wm5 drives, not sure if they would work on wm6.