The compose key and Ctrl+K in Vim both assume the use of Linux, or janky 3rd party software. Compose is the same argument I have already covered with Windows, you need to enter a cryptic key-combination into the keyboard, which is not intuitive.

As for the Vim argument, I'm struggling to work out how to use Vim to type on here? Perhaps you could shed some light? I suppose you could yank-put it, but I fail to see how that is less effort than copy-paste, the other argument I already covered.