If you are GM you have to at least see what you can get for Peralta. In my mind, if you can't get a young, mostly proven 3B/2B/SS to move Ortiz to utility than you need to find a young starter that can come right in and be an option to be one of the 5 starters. There are enough question marks on the SP roster that having options is a good thing.
Priester, Miz, Patrick, Henderson, Myers, Ashby (I think they really need to push this hard), Hall (maybe).
If they trade Peralta for the IF bat, then you probably have to find another Quintana to sign to feel comfortable having starters to get through the year.