Originally Posted by
anabolism
No, not likely (unless you did it frequently). But given that you have a year from first flight to last, another option would be to book it as an extended stop in LAX, with LAX-EZE many months out. Then you can use it the outbound of a different trip to EZE (or somewhere else), with miles or a cheap ticket back.
Thanks. Unfortunately my first leg (beginning of 2020) is going to be EZE-USA, so I don't think I can book a second stopover in LAX at the end of 2020. The system on a dummy booking seemed to be okay with it as a connection city though.