VC-VK had a button on the LH side of the steering column for cruise.
VL had a set of buttons on the RH side of the instrument cluster.
VN/VP had them on the satellite switches around the cluster.
VR/VS got them on the indicator wand - and there is a small cable that comes out of the wand shaft & plugs in, so yes you can adapt it provided you have a latching circuit as on/off is only momentary not latching like on the VN/VP.
As mentioned, this latching is done by the BCM.
VT/VX carried over the same wand as VR/VS, and works on the same principle, and so too the redesigned wand on the VY/VZ.
I dunno where you are getting the steering wheel button idea from (perhaps you have seen them in fraud fowl-cans?) but commodores have only had audio controls on the wheel - from VR onwards, not cruise.