mimo said:
which leads to the next logical question. ¿What are the requirements for a foreigner working in Mexico, and would they hire one?
You would have to have a work permit and visa, generally obtained by employer request and requiring both "influence" and need. This would mean that the person has to have some special skills and documentable experience and standing in their career field outside Mexico.
What that means is that a company would have to feel that a non-Mexican can contribute significantly. In the area of entertainment, there have been any number of foreign nationals "on camera" in TV as show hosts, actors and actresses in soap operas, etc. This is because so much foreign exchange is generated by selling TV shows and novelas outside Mexico.
In radio, there are far fewer cases. One early example was the staff of XEVIP, and English langauge station in AM and FM encarnations, now long gone. The airstaff was mostly non-Mexican. This was approved in the era when Mexico was in rapid industrial development, and many managers, engineers, etc., were non-Mexican. Today, that is not the case.
Today, a good number of the management staffers of Televisa Radio are non-Mexican as the group is 50% owned by a Spanish company, Grupo PRISA. There are isolated cases of other exceptions; I was allowed to intern at what is now GRC in the early 60's and have done a few other things there over the years, but never fulltime (although I have been offered a couple of opportunities).