I don't see how any of that's a problem given that it's not the default for how people run Python. It's a big project that's going to take lots of time by lots

I don't see how any of that's a problem given that it's not the default for how people run Python. It's a big project that's going to take lots of time by lots of people to finish. Keep it behind opt-in, keep accepting pull requests after rigorous testing, and it's fine.