Robert, good discussion you got going here. It's clear and succinct. Just a clarification:
Six Sigma does not provide a template for evaluating an organization’s overall quality management efforts whereas ISO9001 does. I wonder what you mean by template here. Because I think the project charter or TMAP of Six Sigma can handle this.
At any rate, I believe that all quality management strategies complement each other. In fact,sometimes, an organization's structure tell us which strategy or combination of strategies will work.