I'm a retired IT system admin and one thing has never changed. If you can avoid wireless in *any* situation, then you hard-wire it. Wireless presents all sorts of failure and interference problems (dead battery, lost signal, device not connected, yada, yada). Wire it and be done with it.
For situations where no wiring is channeled thru the steering column I've used this approach on a number of off-road cars. Sort of an old-school hack, but it works great.
I basically take an old 5-pin mic plug with a coiled cord (any number of pins depending on the number of buttons, etc). Mount the female connector to the dash (near the steering column) and wire the cord to the switches on the wheel.
Plug it in and done.
*the disconnect is to allow steering wheel removal (a lot of off-road cars use quick-disconnect steering wheels)