If I took it to Mexico, would there be a problem with them knowing how to do this? You'd think somebody would have a little cottage industry for this. And if any folks need to stay cool, you'd think it would be south of the Rio Grande.
Supposedly, you have to be a licensed technician nowadays to even handle R12 in the states. I'm not too technically skilled under the hood so I'd probably need help.
In Rocky Point (Puerto Penasco) on the north end of the Gulf of California, there's signs all over (in English) advertising "We fix R-12 AC".