Okay, take this with HUGE grain of salt, cause I have no experience in keeper leagues.
How hard is it to get stud pitchers each year? I'm guessing easier than getting stud hitters. Because normally I'd trade a first round hitter for a first round pitcher all day long. Maybe this is just personal preference, but I'd rather stack my hitting and try to jury rig a pitching staff than vice versa.
Also what's the worst case scenario? If your pitching goes down the tubes without your second front liner, you can always trade Kemp for a top ace, right? In a 10 team league, (small) I don't feel like I'd worry much about the Chris Young aspect of the deal.
And...just read everyone else's response so that I wasn't biased when answering, and we seem to have a concurrence.