zosload or zoslink function in ctypes module on z/OS

The standard Python ctypes (and/or CFFI) module provides a CDLL function to load an operating system DLL, whose entry points can then be invoked by passing a list of arguments to the nominated entry point:

mylib = ctypes.CDLL("library_name")
rc = mylib.ep_name(arg, arg, ...)

This works on z/OS, which is wonderful, but unfortunately, the vast majority of z/OS-specific functionality that one might wish to invoke from Python is not packaged in a 64-bit DLL.  More frequently, this functionality is available as a load module or program object in a PDS/PDSE.  In addition, 31-bit functionality predominates, although more recently added "system services" do tend to offer a 64-bit alternate (sometimes only) entry point.

Accordingly, I think it would be good to have a z/OS-specific method of fetching a load module/program object, semantically similar to CDLL.  Perhaps the user must specify at this point whether they intend to call a 31-bit or 64-bit entry point (a PDS/PDSE library may contain a mixture of both), as it is complex to work out the AMODE of a load module after it is loaded.  For simplicity, it is probably reasonable to assume the load module implements OS linkage convention - that is, the argument list is passed as a list of pointers to 31-bit storage (since ctypes.create_string_buffer always allocates from 31-bit storage).  If the call to the nominated entry point is made in AMODE 64, each parameter pointer in the parameter list is an 8-byte value.  If calling in AMODE 31, each parameter pointer is a 4-byte value with the high-order bit set on the last parameter address.