I am glad what you are doing is working for you. Fogging is at best very annoying and can be very dangerous. It is like riding blind and nobody would consider that safe. But if an airtight seal is all you needed then diving masks would not fog.
Just plain, open safety glasses have worked the one time that I tested them. Snow and ice on the roads are preventing me from getting out now for further trials.
The safety glasses deflects cold air from your regular glasses so they don't get cold enough to condense moisture. Open is probably better to let air circulate moisture away. At least that is my theory as to why regular open glasses works. We have another thread going on this and I will report my future experiences both positive and negative relating to using open safety glasses.
The icebikers know a thing or two about this and this is what they recommend. See the very bottom of the page.
http://www.icebike.org/Clothing/Ctestedonice.htm
They are available here:
http://www.amazon.com/Visorgogs-Viso...9143422&sr=8-1