Just a thought: Why not let these kids play?
If R Lewis is healthy enough to play/defend at SS, why not let him play say 4 of 7 games, 1-2 of the off games at DH. Would this be better/worse than what Simmons did? Polanco at SS, Gordon?
Then, after 40 or so games, evaluate! At that time, the other SS (presumably Martin) would either be able to play/defend at SS or not.
If we get a rental player for a year (Iglesias ?), they would need playing time.
Bottom line: Is Lewis ready to be a major league Shortstop? Is Martin? If not now, next year?
I really don't like that strategy: I say let em play!!