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OK, I followed your suggestion and made a very lightweight type sockaddr, which has only a constructor, a destructor, and a method called to_tuple() which allows one to get the data out for reconstruction.  I have included, I think, decent docstrings, but haven't patched any of the main Python doc tree.  If you look at the top of getsockaddrarg(), this is the _only_ place this new type interacts with the rest of the _socket module.  Here is a prototype patch.  I have tried it a bit, and I think it works and is safe.  If you have any comments, please let me know.