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what's the compose key? never heard of it but any excuse to not waste a key on caps lock sounds great.
Allows you to do umlauts, accents on letters etc.
E.g., öšéå
to make é (as in pokémon) I do alt + 0233
That's a Windows system, requires a numeric keypad, has been around for a long time. I don't know what its coverage is, though, whether it can do any Unicode character.
kagis
Sounds like not, that Microsoft has its own mapping:
https://www.alt-codes.net/how_to_use_alt_codes/
Problem with the numeric entry systems is that they're kind of a pain to remember. They work all right if you have a small number of symbols that you need to use frequently and can memorize them. But they're less-handy if you've got a wider variety.
GTK-based apps (like, a bunch of Linux GUI apps) will let you do numeric entry of Unicode codepoints if you hit Control-Shift-U and then enter a Unicode codepoint.
Honestly, I'm kind of surprised that the open-source Android onscreen keyboards that I've seen don't support user-configurable popup menus on keys with arbitary characters and text snippets, as it seems like an obvious thing to want to configure.
https://en.wikipedia.org/wiki/Compose_key
Works in X11 and Wayland.
Not as powerful as Emacs's input methods, but it covers a lot of common cases.
Basically, hitting compose causes the next two keystrokes to "combine". For example, / + o = ø, as well as the other letters that are useful to us with extra letters in the alphabet. In addition to that it provides a myriad of other characters such as copyright, trademark, just to name a few.