Display Multiple Website Data 3DgetEvolutionGraph?

I looking for a way to display multiple website data in the 3DgetEvolutionGraph. I do not want to display All Websites as we are leveraging the API in our application and our users don’t have user accounts in our Piwik install. Our users can create thousands of websites and all tracked automatically and individually leveraging Piwik’s API, however I would like to display a graph that shows all of the sites they have setup in a single graph.

Maybe an array we could pass to the 3DgetEvolutionGraph that will pull them all together in a single number? Any ideas? Thank you for your help…