I like this sort of process. I've done something very similar converting scientific code I prototyped in python into c++. I would re-write one function or class

I like this sort of process. I've done something very similar converting scientific code I prototyped in python into c++. I would re-write one function or class at a time in c++, write a binding to it with pybind11, and replace the original python with a call to the binding. There was some extra work with the bindings, but that's such straightforward boilerplate it was worth it.