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Re:The First 15 Years of PyPy – A Personal Retrospective by maxerickson on Sunday September 09, 2018 @10:07PM (#17948938)
There's a built in pattern that is at least similar to what you describe:

https://cython.readthedocs.io/en/latest/src/tutorial/pure.ht...

In the standard library, they maintain both Python and C versions of some modules:

https://www.python.org/dev/peps/pep-0399/

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