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Is it "possible" to be an "AL" only hitter?  Sure.  The leagues historically have had some differences in pitching 'style' as well as umpiring.  NL known more as a FB league and AL known more for 'slop', if you will.  In the specific case of Kennedy ... naaaaah.
Kennedy basically got to sneeze with the Cards as a 23 year old rookie with a .686 OPS in 110 PAs.  And that's pretty much what he hit in his first two seasons in Anaheim.  THEN, he took his game up a notch.  From age 26-30, (the normal "peak" years), he was pure AL ... and he ranged from .795 to .718 ... with the .718 being the age 30 season.
He went back to the NL with the cards and IIRC, got hurt, (only 87 games, but 306 PAs).  I don't know if he was playing hurt, but that was his Ronny Cedeno year - (50 OPS+).  He bounced back to a pretty 'normal' .692 with the Cards in 2008.
Of course, his 2008-2011 seasons he's gone back and forth between Cards, Oakland, Nats and now Ms.  It is VERY common that aging players get 'erratic' production as they age.  I'd be inclined to attribute the last 4 year AL/NL swings more to happenstance than league - (but concede the possibility that pitching style might play a role).
That said ... I think the idea that Safeco 'helps' Kennedy is also probably false.  For his career, Kennedy has a 40 point edge in OPS and a 10 point edge in BABIP *at home*.  He isn't quite as good on the road.  In 2011, (small samples, of course), he's .806 at home and .682 on the road ... and he's running a 40 point edge in BABIP at the Safe.  I think he's better at home.  He's gotten 81 to 59 PAs at home.  I think he's been a little lucky at home ... and the big thing ... I think he's simply had better pitches to hit at home.
In his 81 PAs, he has 2 walks in the Safe.  In 59 PAs, he has 5 walks away.  That's 1 walk per 40 PAs at home and 1 per 12 on the road.  Yeah, the sample makes this nearly meaningless ... except his road OPS is right where you'd expect it.  You would NOT expect him to his .800 (anywhere), much less do so while walking once every 40 trips.
My personal view of aging players in general is, if you can keep them to a MAX 3 or 4 game days in a row, then you can likely extend their usefullness.  It is the inability of the body to HEAL itself from the stress of athletics in 24 hours that I think undoes most MLBers.  Playing Kennedy 4 or 5 days a week ... that's your best shot at keeping him going - so the Baker plan sounds doable.
But, I can't see him sustaining an .800 OPS at the Safe for 6 months.  You look at his 2010 and he managed an .800 OPS in July with the Nats.  That was after posting a .445 OPS in June ... and he followed the .800 with a .611 and .622 over the final two months.