It didn't have a removable battery, but I used to use an older Asus Zenfone 3 ZE552KL that really kicked arse.
It had cards slots, a headphone jack, a built in radio that used wired headphones for signal, and the damned thing was as reasonably waterproof as I could imagine a smartphone to be. It's camera was pretty great for the price, too.
Well, one day it fell very hard on a sharp rock, and the screen shattered. The crack made a hole a few milimeteres deep, and it was about a centimetre wide. It might not sound like much, but the crack in the screen was very much there. My happy arse managed to then have it fall out of my pocket and right into the flush of a high-powered toilet.
I left it to dry for one day, and it worked almost like new again. It still powers up today, but the since security updates stopped years ago, i don't use it anymore. IIRC, it wasn't too expensive, but I forget if there was a sale going on at the time.
I hope I can find another phone like that around that general price point one day. I can dream haha.
I hope that works better for other schools than it did for mine.
Most of the students that went to the school that I went to opted for a "spare" class instead of taking photography, business, arts, programming, or any of the other creative courses. The tools were there in my case, but most people just ignored them in favour of being able to leave school early, or in favour of taking an extra long lunch. They ignored the after school stuff too, because they wanted to spend time with their friends somewhere else.
We had a pretty good photography course too, they covered almost everything and there was even an option to take it for multiple years/grades if you wanted to learn even more about it. The kids at my school who usually did things like Tik Tok and Vine in the bathroom didn't seem to really care for those courses. Social media was just fun for them, they never intended on making anything of it.
There has to be some solution that we aren't seeing yet. There has to be some common ground between "let the kids do whatever they want, regardless of their education" and "dystopian hell".
It would also help if kid's parents were more involved overall, although you could also argue that a huge part of the cause is the insane hours that many of the parents have to spend working to let the family survive.
This all sucks. I hope someone is able to make your idea work, truly. We need a solution, asap.