To do it preoperly is very expensive. Keeping the airbag takes a lot of custom machine work to make the slip rings/connections and stay away from the factory stuff. And depending on how much factory stuff is on the steerin wheel you may not have room. Just putting them on the steering column may be better, although there is still a lof of stuff in there which needs to be avoided. You will struglle to find a machinist willing to do the work, and if you do find one you probably won't like the price.
It would be cheaper to do a dodgy and get rid of the airbag, or maybe some of the steering controls to free up some space in the column. But you will still be spending more coin on the paddle setup then what you will on the controller @ $290.
