That was usually the case “back in the day”, people would use their Amigas and Ataris to prep work - I’d use my Atari ST and GFA Basic to generate all sorts of lookup tables which was too tedious to do on the C-64 (esp. if all you had was a “datasette”)
I also used some Haskell in another C64 project. Made a VICE memory snapshot parser for digging some values out of RAM. Haskell was a lot handier for byte level access than Python.