Omg thank you! I was just starting to look for alternatives

Unfortunately OpenKeyChain is now no longer being developed. It still works… for now.

Not a teacher, but my mother is a retired professor.

It would absolutely work on a large percentage of students, especially the type that are so lazy they are plugging their assignment into an ai. She retired in 22 and had students that had never used a desktop computer with a mouse and keyboard, only phones, tablets, and ChromeOS laptops. Text formatting, beyond the very basics of bold and colors, were a new concept for them.