you can change them very easily and there not stupid money, mine now press easily with a nice click, had to press them with an old coin before, very hard to do, made driving it so much nicer.
they may be riveted in place, just drill them out and use self tappers, make sure there not too long or the first time you press the horn it wont stop!!!
i didnt unplug airbag, just placed it on the dash, gentley!!