My question is a lot more general than just sending money to El Salvador, you are right. But if your reply does not satisfy the specific problem constraints of

My question is a lot more general than just sending money to El Salvador, you are right. But if your reply does not satisfy the specific problem constraints of sending money to El Salvador, then it can't be a solution to my more general question of how to send money internationally regardless of whether or not your counter-party has access to the correct kind of banking services (or none at all).