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FYI, I think this is the culprit.
In Python/pylifecycle.c:
static char*
get_codec_name(const char *encoding)
{
 char *name_utf8, *name_str;
 PyObject *codec, *name = NULL;
 codec = _PyCodec_Lookup(encoding);
 if (!codec)
 goto error;
 name = _PyObject_GetAttrId(codec, &PyId_name);
 Py_CLEAR(codec);
 if (!name)
 goto error;
 name_utf8 = _PyUnicode_AsString(name);
 if (name_utf8 == NULL)
 goto error;
 name_str = _PyMem_RawStrdup(name_utf8);
 Py_DECREF(name);
 if (name_str == NULL) {
 PyErr_NoMemory();
 return NULL;
 }
 return name_str;
error:
 Py_XDECREF(codec);
 Py_XDECREF(name);
 return NULL;
}
If I figure out a working patch I'll post it here