I don't want to sound like a jerk but I dont think you realize how integrated and complex your car is. Or how car audio works in general. No, neither of those would be possible and please don't go hacking up wires trying to get it to work because you can only do more harm than good.
This thread started out with steering wheel controls. which is possible. But you got the cheapest HU kenwood makes and the only one that can't do it. Take it back and pay $10 for the next model up or a similar brand with remote so you can use the SWI-X interface. Or pick a cheap one with a remote jack on the back. The cheapest Kenwood that can do that would be the KDC-HD545U.
And with all this being said, I must ask WHY would you buy this cheap Kenwood unit? I can't think of what feature it has that your factory radio doesn't other than a front input jack. You can get a ton more features for just a tad more $$.