To be honest, upgrading Python (if you’re not on a Pi) is pretty painless, and it usually takes a lot longer than a few weeks for the new Python version to be validated. I’ve been running 3.7.3 until the deprecation notice was released, having upgraded to that only when 3.6 was deprecated.
At best, I’d follow the Docker containers, upgrading only when they update. Updating once a year is easy enough, and if it’s not then it’s probably time to switch to Docker 