Ribbon font/scaling

I would like to change the font for the complete Ribbon system to Arial 9 und be able to scale it for people with visibility disabilities.

The Styler components have many font settings, is there a way to change them all together?

To separately control the fonts for the various parts of the ribbon, there are indeed multiple font properties. There is at this moment not a way to somehow automatically change these all at once. You'd have to write the code to adapt each of these font properties.