Er you can remove the large + & - buttons from the air con unit as I have done it with mine to replace some worn buttons with some better ones from a A4.
You will need the following items:-
A finger
A fine edged blade or small flat screwdriver(jewellers type)
Press down on the top face of the button then with your blade ,work it under the botton edge of the button and gently lever it out.
It should not take much effort and the button will ping off.
You will see that the switch is quite a basic rocker one that just clips onto a central pivot.