Believe me, this has nothing to do with the way it was used
The GM foam style steering wheels from that time weren’t high quality
As for the horn, I could tell you what it’s going to take to fix it, but you probably won’t like it
By the way, your idea of buying the junkyard parts still won’t fix the problem with the horn
Do you want to hear it . . . beware it typically requires some special tools, extremely good eye sight, a lot of patience, and you don’t mind stabbing yourself in the finger and palm