Can I ask why the rush to study abroad as a high schooler vs while in college? It’s my impression that chosen carefully many colleges have study abroad programs that are academically rigorous (I had a friend who went to Oxford - definitely rigorous!).
My son is also very interested in study abroad so he’s doing one of his schools summer trips and he is looking at colleges with study abroad option that fit what he wants. That might be an easier way to get a similar experience.