Thanks for your input so far. I guess I have to start from NRT if I want the ICN side trip.

Maybe I'll use my CX number on the CX flights, and my AA number on the AA flights. Since they are all clustered (CX up to London, AA for the rest), I could switch FF numbers halfway through. I'll have to "throw away" the LHR-ARN-LHR segments in terms of earning miles, but its not a lot.

Also, my co-author and I flipped a coin, and he won, so he got the free tickets and I'm stuck footing my own bill (well not really me, but not the Jan Wallanders och Tom Hedelius’ Stiftelse, who's flying my co-author in).