Received a heads up and confirmation from Wagner L that the McRib has returned to McDonalds’ menus across Costa Rica!
After some looking around, I found that the offerings there will be the “classic” McRib, an option with cheese, an option with two patties, and an option of adding bacon. The McRib will be offered at “more than 65 restaurants” in Costa Rica, which is interesting as Wikipedia and other sources say the number of stores is much fewer than 65.