Firefox, actually I have never seen the current smoke buttons "live". From the pics, when unlit, they look great and seem to blend perfectly into the fascia. My idea was just as easy: "steath buttons", as you rightfully said.

So, whatever solution is more convenient for you, it's good for me. Also the flat black buttons would be great, I think (making a small holes in them would be definitely good too, if one wants lighting).
I just though that stealth buttons are a good solutions for those who cannot match the gray ones (original) to anything in the car.

I am keeping my fringer crossed, and I'm curious to see the logo for them!!