So I just tried to pass fullname in import.c and it didn't work (of course). Looks like even when I try to use fullname in find_module_path_list() and load_next() it is still leaving out the package name. Ugh. That means either refactoring import.c to get the full name in all places, not get the full name (and thus I'm still screwed), have importlib do something different than import.c in hopes that importlib replaces import.c before this goes public, or add a full_name attribute for importlib to fill in with the full details.