So I was actually thinking the same thing. I got some the LCI paddles and I noticed on my car that all pins in the back of the steering will were connected.
I figured with the newer multifunction buttons, newer paddles with resistors that there should be a way to hook it all together and code it with out the need for harness (although I bought some connectors and some cable to make if I am forced to)
I will be looking forward to seeing what comes of this thread. And if you need for me to test anything out let me know.