I like your solution! Thank you.
About my computers: I have 2 1GB RAM laptops. One has 20-25 years the other one 10-15. I have tried Puppy and antiX in these. And I personally prefer antix on them. Another 4GB laptop that might be around 8 but is pretty trash as it was a gift from our bank (it was able to run Elementary OS, it was fine). A kind of old computer but with 4GB RAM (Think I have XFCE or Cinnamon Mint on it). And a big boy with 16GB and a pretty good CPU. And the oldest computers are used the least often (maybe once a year) while the middle computer might be used 20 times a year and the last one maybe once every week.
So I believe something like antix would work, but I’m not sure if the USB way would. Seems like they would lose their pendrives the second day.
I use budspencer theme on fish. https://github.com/oh-my-fish/oh-my-fish/blob/master/docs/Themes.md#budspencer-theme It looks cool and yellow, which I like. I prints the path on the far right and parent folders are printed only with initial letter, so it doesn’t take 2 lines in the shell and it ends up pretty short. It also has git integration and some budspencer exclusive commands to perform some cools actions, I don’t care about and I have never used. Also, I like that command errors are displayed as ✔ or ✘ on the next prompt. It also prints the time the last command has been running. I use vi keybidings, so prompt color changes when I change the mode feel cool. I would also like to have the execution time for every command, but I have another theme for that I don’t remember the name of on my work machine.