I share your frustration with the lack of data in AK, it annoys a stats junkie like me to no end
To address your point, McCain was the establishment candidate in 2008, Romney was the conservative....look where the two ended up. AK is not an establishment state at all, if you look at the dynamics of the 08 race, you'll find that Romney should actually come in last this time around, but we both know that wont happen. I have visited the state and the lifestyle is very different from the lower 48. While they still may watch Fox, they're is a much more noticeable libertarian streak. They dont call it the last frontier for nothing.
I'd put the odds at about 50/50 for a win in AK, again because of the lack of data, and the fact that Romney may still have a good presence there. Time will tell