Just to add a bit of my opinion after reading your comment in the context of this thread and not to the merit of your idea. You are precisely the type of person

Just to add a bit of my opinion after reading your comment in the context of this thread and not to the merit of your idea. You are precisely the type of person I'd keep very very far away from multithreading in any business software project and also why I advocate the GIL to stay. If you want to do that, go solo in your own time, or try apply for a research position in some giant tech Co.