Brian - It's not that hard to run a new wire for the horn. You will need to get a new bearing for the steering column.

I have some pictures of the pieces that make up the horn button assembly. If you need them I can email them to you. Sorry I can't post them here (long story). I think you can get all the parts from most of the vendors. The only part thet might take some looking is the three prong retaining piece that goes under the steering wheel.

Let me know if you need those pictures and I'll get them off to you.

George