LA 601 is bookable, but from what I can see there's no service scheduled beyond April.

LP 515 & LP 427 are also bookable, but they show no service beyond early may.

I don't know if this is just because LA/LP have simply not loaded their winter schedules or maybe because that service will be discountinued.

Either way they are not in the system past april/may, so I can't see that you will be allowed to have the ticket reissued as LIM-EZE, without a valid flight being available.