Downgrading back to 2.17 from MicroSD?

[tphone]

I have been playing with the leaked rom for about a week, and while it's cool to have gps and semi-have Rev. A, the lack of consistent tethering performance is a deal killer for me. And I LIKE On-Demand I've decided to wait for the official release and move my mogul back to the 2.17 release until then.
Has anyone downgraded their phone by extracting the .nbh file from 2.17 to a microSD card and hard reseting? Like upgrading from the card in reverse?
I'm hoping that this is quick and easy and someone has already done it. Then I don' t have to worry about which version of the unlocker to use or anything else besides the 4 hours it will take to get my phone back to my personal specs.
If I don't get a reply, I'll try it and post my results