Can system touchbar icons be accessed?

I just got a macbook pro and was about to return it because the touch bar was so upsetting to me... But then I discovered Better Touch Tool and how it allows me to override the insanity that Apple created. So, my plan was to create a simple STATIC minimalistic touchbar consisting of an esc key, brightness, and volume.

Currently I am doing - + for brightness and < > for volume, but I would much rather use the actual apple system icons for those. Is that possible?