I might be interested, depending on the day/night.
Right now I play with some Argentine guys. They're all friends from years gone by and I just latched on. What they do is- RENT A MINI FIELD and then play 5-on-5 or 6-on-6 with just friends. Not in a league. Other friends have done this as well.
The places I know to rent fields are Parque Norte (near the River Plate Stadium), Parque Thays next to Retiro Train Station (more or a Recoleta area), Club de Amigos (closer to Palermo on Av. Figuueroa Alcorte... don't know if this is public), and a couple of places in San Telmo.
These fields are usually the size of indoor courts and often you use a futsol ball that is heavier and doesn't bounce as much.