How about Luke Hochevar for Adam Jones straight up?
Now wait, hear me out. Hochevar was 8-16 185IP 5.73 ERA 73 ERA+. That's identical to Arrieta who went 3-9 114IP 6.20 ERA 71 ERA+. So same player. And since O-Fan wants to give up Arrieta for Billy Butler (140 OPS+) I think it's perfectly fair to respond by asking for Adam Jones (124 OPS+) in return for Luke.
Dammit I should just be the GM of the Royals and get these trades done.