I might be a newb but I am pretty sure at some point the blueprints are converted to code in order to be used by the game. Would be nice to see this exportable or editable within the editor itself. Then adding C++ to it would be nice which could just appear as a block on the blueprint stating c++ code is located within that part of the blueprint and possibly also lock blueprint features from being edited in the blueprint and force the jump to the code (if it has been customized, to prevent issues).
As I said I am a newb maybe this is already possible but if not it seems like it wouldn’t be too difficult to implement.