You might be able to do this transparently with a [MetaPathFinder](https://docs.python.org/3/library/importlib.html#importlib.abc.MetaPathFinder https://docs.py

You might be able to do this transparently with a [MetaPathFinder](https://docs.python.org/3/library/importlib.html#importlib.abc.MetaPathFinder https://docs.python.org/3/library/importlib.html#importlib.a...), the only trickyness would be replacing the lookup in sys.modules which I don't think has has an official interface.