[procinct]

I don’t have a touch bar but I do this too. I have it mapped to escape when pressed on its own and Ctrl when pressed with another key and that works great.

[esmi]

This is really interesting. Did you have to do anything special to make it work in OSX?

[procinct]

Yeah, install Karabiner Elements. It's a handy tool that will let you do a lot of keyboard customization.