Looks interesting. I've always remapped capslock to CTRL myself, of course, but haven't thought of remapping tap-capslock to ESC. It looks like you need external software to do this though (like Karabiner Elements on mac, or xcape on linux, etc).

(That being said, if you're used to jk/kj/fd/jj/jf, many years of muscle memory would still take a while to erase...)