If you are going to call up people that is not in the 40-man, I would prioritize the bullpen pitchers: Meyer (although he is going to be a starter, it would not hurt to give him a few innings from the bullpen as a first try), and Oliveros. From the hitters, maybe Beresford. You can argue for Romero, but as you say, that position seems to be covered by Plouffe, Nunez, and in the future, Sano. Bernier was already here last year, he is not going to help the Twins in any way.