Interesting, but on macOS 10.12.x it must be Karabiner-Elements and at least the UI does not make me replicate this behavior.

Editing the JSON config will do the trick as described here: https://github.com/tekezo/Karabiner-Elements/issues/8

There is also a solution for Hammerspoon users here: https://gist.github.com/arbelt/b91e1f38a0880afb316dd5b573275...

Or Keyboard Maestro: http://apple.stackexchange.com/a/256055

https://files.grid.in.th/11RiNt.png

That's not a bad option and I had not considered it. I will try it out, thanks!