Using function keys without setting up touch bar to use them
I have a Mac with a touch bar, and hence no physical function keys. Most of the time I don't need to use the function keys, so I've set up the 'fn' key to show emoji and symbols on the touch bar instead of showing the function keys. I'm happy with the way it's set up and don't want to change it.
However, once in a blue moon I use an app that expects me to use the function keys. So I need some way to generate function key presses. Is there any way to do that without having to change the way my touch bar is set up?