Thank you very much for the correction, David Eduardo, regarding rancheras.
I want to appeal to what you call "Greater Colombia" as a target group.
"Greater Colombia" is not a good translation as it sounds like one nation or one people, like "Greater New York" to define the NYC metro area. "La Gran Colombia" was a single nation that soon split into three, and each is separate... but many call the area of them Gran Colombia just like we call Chile, Argentina, Uruguay and Paraguay and, sometimes, Bolivia the "Cono Sur".
As such, Gran Colombia is Gran Colombia in English, too, just as we don't call El Salvador "The Savior" in English.
You know firsthand many Argentine bands that achieved popularity throughout the region, including Mexico and in some cases Miami as well. The times any of these bands were played (if they were played at all) on La Exitosa were very sporadic, and the songs in Spanish were mostly ballads with the same handful of artists.
The problem is not whether the Argentine artists and band were once popular... it is that the AC format that was the base for such music has grown too old to be marketable to advertisers.
In other posts, you've mentioned the large number of radio stations with programming in both English and Spanish in Latin America, even though the majority of the population is not bilingual. Is it a crazy idea, or downright stupid (I don't take offense easily), to appeal to a similar model, or is it too small a niche to be profitable?
The people who listen to those English music stations are upper and upper middle class folks. They don't migrate to a foreign country with a different society. They live better where they are than they would here.
Example: my oldest daughter lives in Ecuador. She listens mostly to the kinds of songs she grew up listening to on Radio Musical in the 70's and then other pop stations in the 80's. Those stations played as much as 50% songs in English.
She would never consider living in the US when she has maids, a cook and even a driver in Quito and a lovely house with an indoor pool!
In other words, there is no audience in the New York market for that kind of format because upper middle and upper income people who like music in English don't migrate. The exception is Southeast Florida, where migrants from the socialist regimes of Venezuela and Colombia and the violence and socialist period in Ecuador have migrated "in exile". Many will go back home if those nations become more livable.