I'm actually doing a small Catholic ceremony the weekend before my Mexico ceremony. The Catholic ceremony is immediate family only, with grandparents (who couldn't travel to Mexico). No aunts/uncles.
I'm doing a legal ceremony in Mexico. Now, I just met with my priest (who is a relative) and he wants us to do the legal paperwork for my Catholic ceremony. I'm against this as I am using MX as my legal ceremony. I may just get the paperwork, sign it at the Catholic ceremony and never turn it in- just use my Mexico paperwork with the Apostallite seal.
My priest is a bit confused with my intentions. My views really separate church and state. I'm a very private person, particulary with religion and therefore, don't want alot of people around. Since my DW represents my close friends and family, I still want it to be special and recognize it as my legal ceremony.
I would maybe try to get a priest who's a bit more progressive and do a legal ceremony in Mexico and then do your Catholic ceremony when you return.