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I tried that, but found it annoying to occasionally get kicked out of insert mode while writing. I ended up rebinding Caps Lock to Escape instead, with Shift+CL to toggle caps; I quite like this rebinding even outside Vim. Two lines in autohotkey on Windows, or setxkbmap in X11.

This is the first thing in my config, whenever I try to setup in a new system. Now "kj" and ":w" has become more like a muscle memory, even when I am just staring at the abyss...

Then you can't type words that have jk or kj in them, right? :) Depending on languages used it could be a blocker

you certainly can. it just requires you to wait whatever the timeout is set to. it doesn't come up all that often and i've used it for a long time.