Bit the bullet and put in an order with Russell
for one of their seats. Got an email back with a schedule build date of September 13th (6 weeks from now).
Not the greatest looking seat on a F800GS but for me they're a known entity. I've bought many seats off them and have only had to have one refitted. That was done quickly, professionally and to my satisfaction.
I've got a spare seat for the F800GS (bought on eBay) so I can swap out seats, based on the intended usage. The airhawk I bought is good for a 1-2 hour ride on the stock seat, but I wouldn't want to use it on a long trip.
Here's some pictures of the Russell seats on F650's (didn't see F800 pictures)
**UPDATE** Found these pictures from this thread