David J. Anderson has posted this question in a couple of places. My answer in short is: Yes.
I would certify the theoretical understanding of the individual to act as a coach.
"Kanban Coaching Professional" can be a good title. As the title suggests the certification will support the fact that the professional can coach a team guiding them through continuous improvement, from following Deming's System of Profound Knowledge and the 14 Points for Management all the way up to your 5 steps in the recipe for success.
I personally like the idea of Project Coach better than Project Manager. And of course as any other certification, passing it does not mean that you are actually a seasoned coach but that is of course subject for a different discussion.