Did some more development on my 4-in-1 button (was 3-in-1). Here shows what other variations would be available on the dashboard and what they would each control.
A very quick GIF shows perfectly how it would work.
Final refinement of the HUD in Photoshop.
The first mock up in Keyshot showing off the new HUD screens and what I looks like in comparison to the rest of the interior. Buttons to follow shortly..