You are right. Since I asked the question, I pulled the steering wheel to look at it. Easiest would be to route a wire from the fixed contact.
I plan to use a Rennline quick release with a Rothsport hub. Both of it did not have a street car in mind. I think I can modifiy the Rothsport hub to still accept the contact ring, first of all to keep the cancelling mechanism. With a little thinking in mind, the hub could have been machined like that in the first place.
The Rennline release is a little more complicated. In addition to fact that it has no build-in contact for the horn, using a Momo steering wheel it is designed for, there is no room for the horn button. I think I need to fabricate a little spacer to make room for the Momo horn button.
If I would have know all this before, I would have chosen a different path. But now I have all these relative expensive parts to be used...
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