Transitioning from language student to English teacher inquiries

I (31M American) am currently applying to JET. I'm fairly confident in my application (I've taught abroad for 7 years, have my TEFL, lived in multiple countries, currently N5 and taking more Japanese courses) but know most people call it a 'black box' of a selection process so I'm trying to find backup plans I can take to teach in Japan. Yes, I know the industry isn't the best but I love teaching and would like to be there a few years.

If JET doesn’t go through, I'm looking at a few schools (Aeon) to apply to, but I would rather already be in Japan when I apply (most jobs I've seen would rather find someone currently living in Japan as well). That is why I'm currently considering studying Japanese at a language school first, and then applying to teach while there. How is the process in transitioning from a student visa to a teaching visa? Is it better/worse than applying directly?

Thank y'all!

by Evening_Beer2417