I'm marking the patch as rejected, but leave it open. It seems clear
that it cannot be incorporated into Python because of the maintenance
issues (the only reasonable way to incorporate it would be if a
long-time Python contributor steps forward and offers to maintain it,
which seems unlikely).

I'm leaving it open for the moment so people can easily find it. I
encourage you to find some new home for the patch, e.g. by submitting it
to PyPI (or to some System z community page if there is one); at this
point, it should be closed.

If the patch is still around five years from now, and still maintained,
I might be interested in stepping forward to support it (assuming I am
still a Python contributor at this point).