Remaining in Japan while unemployed on a valid work visa

Hi everyone,

I wanted to get some thoughts from people who may have been in a similar situation.

I’ve been living in Japan for about ~2 years on a 5 year Engineer/Specialist in Humanities visa. I’m considering leaving my current job to study Japanese full time (at a school which allows this without having a student visa), but I’d prefer to keep my current visa instead of switching to a student visa. My thinking is:

1. From what I’ve heard, immigration generally allows you to remain for the duration of your visa as long as you continue paying taxes, pension, health insurance, etc.
2. If immigration were to contact me and move to revoke my status, I could switch to a student visa at that point. Since a student visa is generally limited to two years, staying on my current work visa first would effectively let me remain in Japan longer before starting that 2 year clock. From what I’ve read here, it seems uncommon for immigration to proactively reach out, and the visa technically remains valid even after being unemployed for more than 3 months.

If relevant: between savings and capital gains which I can remit to Japan (and of course, report and pay taxes upon), I'm set on money while hypothetically doing this.

Does this sound reasonable, or is it a bad idea for whatever reason? Thank you.

EDIT: Alright, sounds better to simply switch to a student visa — thanks all for feedback.