Ultimately, if you want the best solution with custom per-button screens and doesn't cut any corners, you might want to get ...
Entering special characters on a PC can be cumbersome, but WinCompose makes it much easier, especially for keyboard-focused users.
If you have Agda properly installed (to check this in your terminal, type agda and see if it's on your machine). Open an Agda file and you should be able to load it by typing C-c C-l. It's okay if you ...