At least the fighter department wouldn't do something as daft as this. There is no way that they would buy 15 cast-off 1960s jets from, say, the US Navy when the only common item would be the radome and then try to integrate them at minimum cost into the existing line up and find out that it just wouldn't pay. And then call it something weird like F-4J(UK) or F-4 Mk3. Just wouldn't happen.