Interesting - I have and use an RME Fireface 800 over Firewire, latest Windows 10 - there have been issues, such as when Windows updates it changes the Firewire driver from the legacy version (which seems to work the best on my system) to the standard driver.
All in all things are getting a bit lumpy on Firewire, so I am busy looking around for a USB interface - sort of decided on a USB3, just not sure of make yet. Was thinking of the Tascam Celesonic 20
But this work round does sound interesting - I don't have thunderbolt, is there a USB3 version would you know? If yes, i wonder if it would improve performance?
Cheers
Nigel