Are these Windows machines you need to restore? If so, this stands a chance of working I haven't tried it (yet), though I intend to at some point:
Assemble the .vhd and copy to external media.
Try using the "restore from image" option in WinPE (i.e. booting Windows Install media or rescue disk)
As I see it a .vhd image is a .vhd image, so the windows native restore ought to work just as well with a .vhd made by UrBackup as one made by the native Windows backup.
It's certainly something I'd try in a situation where a "sneaker net" operation is faster, or as in your case the network traffic for the default restore method is not permitted.
Of course I may be completely wrong, but it seems worth the experiment. It would be "nice" if the UrBackup rescue media presented the option to pick from a .vhd on local USB storage, but hopefully what I suggested may do as a workaround till it does.