Jesse,
It seems that the patch was merged into py3k by r65883.
The trick was
    from pickle import _Pickler as Pickler
to get the subclassable python implementation.

The only remaining point is the handling of dictionary views
(see rebuild_as_list() in managers.py).
I had to register them with copyreg.pickle, because the C function
connection_send_obj() uses the original pickler.