Good old BFI. Lots of senior guys there I'm afraid. The best chance with AMF in BFI would be the Chieftain. But I used to work as a contract pilot in the BFI area in '05. I routinely commuted down to PDX for work at the employer's expense. My .02 would be if you want to stay in SEA, then get your resume out to the FBO's at both BFI, TIW, PDX, and HIO. Also start making friends with the local pilots.
Clay Lacy and Galvins both have charter depts out at BFI, Also if your current still in the Helicopter there are those gigs too.
If you PM me, I'll provide some names and dept's if you'd like with both AMF and other outfits. Also if you don't have your ATP, get it.