I prototype in C++ all the time. And then refactor it to production code if it makes sense. Switching between languages seems like a waste of time to me.
I can program in Assembler, C, Java, C#, JavaScript, Typescript, Ruby, Haskell etc. And there is zero empirical evidence that Python is “significantly” more productive in the short term. My guess is that it is only true if you don’t have much experience in any other languages.