Or a climate control module with more of the buttons could be sourced. Driver has no need to be drilling holes in the climate control module, there’s a way to do this install cleanly. From my google results of the climate control modules with multiple switches (more than three) the switches clip into the circuit board. I’m hoping that Volvo went the Toyota route and wired every single car the exact same, no matter the options. If Volvo did, there should be a circuit board behind Drivers face plate (he knows what I’m talking about) that is just waiting for switches. Continuing with this assumption, there would need to be programming for the switches, too. I am not sure how possible this is, but if what I said can happen, then I wonder if he can get the factory connectors and connect to this module and wire the switches to his lights, no interior drilling required.