I actually like DeJesus for the rest of the year, but he presents a couple issues:
He's yet another lefty bat with platoon problems, (even though not as pronounced as, say, Hermida's) , and like you said, he's the ultimate tweener, can do a lot of things, but none of them particularly well, on the flip side, what he can do is play good D all over the OF and he brings an element of speed to the lineup as well as flexibility since he can hit in a number of spots.
To answer your question specifically, i'd deal for Dejesus, but not at that price. Doubront is a no-no for what equates to an insurance plan.