Well, if the fast track rule is "elite card holder flying the airline of that elite card" then I should be denied when flying on SK.
But the web doesn't say that and such a rule doesn't really make sense. A3 has 1 flight from CPH each day (plus a few codeshares). Why would they enter into a fast track agreement for one flight a day?
I am pretty sure fast track scanner have allowed my *G earlier, so this was a first for me. And the BP worked fine in the lounge scanner.
Also, TPJ posted #15 saying both agent and scanner allowed the combo SK and TK*G.