Once you wire your horn in, the steering wheel won't be removable, correct? If you're interested in keeping it removable I have some pictures and CAD files you might be interested in. We have the NRG 2.0 release in our racecar, and I 3D printed a piece to go in the wheel hub that allows us to use the horn wiring as a PTT circuit while keeping the wheel removable. It would be simple to make that work for your horn.