The correct answer... sorry its kinda late.
There are two different horn connections and two different retaining methods. You can have a wire or a pin. In your case a wire is desired.
Your column has the ring style retainer. That metal pin can be removed with a quick tug with a pair of pliers. there is a lip on the retainer holding it in. The other style has a little tit that locks down in a j slot.
The solution for your project is to cut the spade connector off the wire and remove the tit retainer and replace it with the lip retainer. Bingo problem solved.
also note.... that horn button needs a ground wire as the O ring prevents ground. Otherwise you will have intermitten function of the button.