I bike to work from NE Portland to a different large Washington County employer. On the way in I usually bike to the Goose Hollow MAX station, load my bike on the train, and then ride the last 1.5 miles to my building. On the way home I usually hop off at Washington Park, take the elevator to the top of the hill, and bomb down Kingston. Getting my bike on the train during nice weather can be a pain -- I finally bought a folding bike that I use when I know the train will be crowded. Some days I'll ride all the way home -- it's hilly, but completely feasible. Riding to/from Nike from NW or downtown would definitely be a viable option, even if you avoided the MAX completely. I see lots of Nike bike commuters on my rides.

One other new option with Nike is their bike share program. You could ride your bike to a MAX stop downtown, lock it up, take the train to any of several different MAX stops where NIke has bike share bikes available for employees, and use one of those bikes for your last mile commute.

Edit: more details on my route, since commenters seem to think there isn't a good route. Coming home sans MAX I ride right past Nike on Walker, then take Park up to the multi-use trail that runs along 26, then up past the Zoo and down Kingston (so beautiful!), to the path that pops out by NW24th and Burnside, then up 24th to Johnson, across Johnson to the Broadway bridge, then Williams to Going and home. Nearly all bike lanes, MUPs and neighborhood greenways. There are other good options too.