I think the only way to get to the city and back is with a SB excursion . Just beware that EZE can be difficult in the best situations. Just because they get you back to the airport SB won't be able to expedite the process once they drop you off.
I heard back from them and was told that its not open for booking those dates yet but they she would see what she can do .......... Fingers crossed that The Quality is not where we windup .