Make Buttons Shift + Option responsive?

I'm a big fan of using the Shift + Option key to increase/decrease Audio Volume and Screen Brightness on my Mac, but now I've reconfigured my Touch Bar I cannot seem to have that.

I know I could change the function of the keys to change the function of the brightness or audio in those smaller increments, but I am so used to going up and down to the general volume or brightness I need and then fine adjusting that I'd love to keep it that way if possible.

Can anyone think of a way to allow for the Shift + Option keys to modify these functions?

Cheers,
Matt.