What about Mike MacDougal?
MacDougal just got released by the Marlins. He had some successful years with the Royals, and was struggling this spring. Now, maybe he's not closer material- although he did convert 20 of 21 saves last year, but he might make a good 7th inning or jam man- He does have high walk rates (Keep him out of the 9th inning- bring him in with a base open), but he also has 95 MPH heat and a induces a lot of ground balls which sounds pretty attractive for GABP.