Rich,
I might be interested in joining you. Like Julian in his report I DNFed my first 600 this year (also the Three Coasts) so I lack a 600 for my SR.
However I am going touring tomorrow (rough route: Maidenhead-Cape Wrath-Maidenhead) and will not be back until the weekend before your trip by which point I will either be
a) in no state to ride due to a collection of niggling injuries
b) utterly sick of the sight of the bike and not wanting to ride until Feb
c) stonkingly fit, battle hardened, and raring to go
There is no way of telling
I will bookmark this thread and look it up when I get back. I can arrange my own accomodation if needed.