Trying to find some nice matching healthy roots to use.
Will try a couple today and post later.

Troyb  OK :-) your second group of pictures was awesome !I didn't think this thread could get better but it sure has!

Managed to do a couple of root grafts using single buds.  
Did a cleft graft using roots instead of scion on one and the other a side and cleft.  It was relatively simple operation. 
I wonder why more people are not doing it? 
Will find out if the grafts actually work in a few weeks and will update this post with the results.

Nice pictures Joe! I think you should start seeing root growth in 2 weeks if its warm. I know what you mean about it being easy. It feels like it's too simple for it to be successful, and that it has to be wrong. Maybe the root growth I'm seeing is just a fluke, but I think it works.
I'm glad people are finding this useful, Thanks for the comments.

18 days later- here is a picture of the tiny cutting that I just wedge grafted 2 roots into the slit. It is showing both top and bottom growth. Before and after.

17 days later- all 5 of the cuttings I grafted are leafing and growing massive root systems. The one is growing roots above the soil. I even had one that was already leafing out when I took the cutting and is still green with growing roots.

9 days after root grafting a cutting that had developed root rot. It hasn't shown root growth yet ( I used small root pieces) but there are buds forming. The second photo shows what it looked like before. Both grafting methods are proving successful.

Hey good luck with it. 
Even if the grated roots die the cuttings has a chance to grow its own roots.
Would love to hear how this turns out.

By the way the 2 root grafts I did last week are showing no signs of roots or buds. 
Last week I also did a couple of cleft grafts and one of them is showing signs of bud growth.

Joe, I was going to ask how yours were doing. Did you put the roots in soil or perlite? I found out the term for what we're doing is nurse root grafting. It's used for harder to root plants by providing the cutting with nutrients while it forms its own roots. They usually bury the scion below the graft point in order for roots to grow. I didn't because I wanted to know that the grafted roots were stimulating the growth.

I noticed that one of my Violette de Bordeaux cuttings was wilted due to stem rot. I'm going to try nurse root grafting to save what is left. If You notice, it is a very thin cutting and I had to cut up to the last 3 inches to avoid the stem rot. I got roots by grabbing the inside of the pot of my black mission. Thus, the quality of the routes is questionable. If this one lives, I will be creating a separate post on how to save rotted cuttings. So far it has worked for the other three that I have done, but they were not as wilted, thin, or as rotted.

Reviving this old thread because this seems very interesting. Could someone please update on how this project turned out?

Sorry none of my root grafts worked. 
Have not heard of anyone succeeding so I don't think it can be done.  If root grafting worked there would be no need for rooting cuttings or grafting scions..lol