Don't know if Eric was kidding or not. I've seen it done.
Very interesting concept in grafting saplings for support. Let me know if you ever get the chance to try it. I have seen grafting used to bridge a girdling injury, but never as support.
Since there are few historic trees in Denver, my strategy is usually to remove the junk and start over. I'm not one to advocate putting a tuxedo on a turd. I am impressed that your person of important interest had the sense to ask for a second opinion. Very rare in my world. I wish you luck in the preservation of this tree.
Instead of concrete we use these
http://karlkuemmmerling.com/prod15.htm
Have pulled up and anchored some pretty hefty pines with them. Just need to make sure there is no decay present near the anchor point in the tree.