Most CCU switches are available from Porsche, but I would advise to be well seated when you hear the price, they cost about 140 Euro/pcs.
Changing the switches is a bit fiddly, and the front panel plexiglass frame often cracks when taking out the switch. This frame is essential for the mechanical construction of the CCU front piece.
A polish company offer a CCU switch refurb service, but I would not recommend this at all. I sent some switches to them, and the quality and result is sadly under par.
I have yet to see any stickers available, but I have plans to offer this. Such stickers must have a transparent logo.
Cheers,
Tore