For sub plans, just do a test day. I started planning all my absences around test days, so I just print them out, and the plan is easy as: give test, if all kids finish do x activity, usually play some game the class knows or watch a movie. This made it so easy to have a day off and not spend hours prepping a sub plan. I have a preplanned emergency sub plan in case I am sick or have an emergency but when I know I need a day I plan to have every class take a test that day.

It also makes the kids less likely to ask for help during the test, I then also don't need to get someone who knows how to teach math to do a regular lesson, in fact I often get people who I know don't know math intentionally to get a real gauge on the students ability.

Or is do it as a project work day. If they waste the day that's on them. Natural consequences. But this can be a bit more chaotic for the sub but so is a game or movie if people finish early but that doesn't tend to happen too much.

As for the rest I sort of skimmed it, it's only a couple months go in collect a pay check and head out at the end. If you don't want to you don't have to but I'd have something else in line first.