[CountSessine]

I've been using Caps Lock as Escape

That's easy - what @Lio was talking about was having Caps Lock be a tap for <Esc> and then holding it with another key would be <C->. Is that what you're talking about? Karabiner can accomplish this on macOS, but I can't find a gconf/gsetting/xmodmap combination to do this on Linux. Caps Lock as Escape is easy. Caps Lock as Ctrl is easy. Caps Lock as both doesn't seem to be possible on Linux.

Am I wrong? Can you point me toward more info on this? I'd really appreciate it - I would so love to be able to use tap-for-escape in all readline contexts.

[Lio]

That is exactly what I meant.

The worry about building up muscle memory around something not portable is exactly what lead me to force myself to use C-[ as Escape too.