Envato toolkit, one updater to rule them all

I develop WordPress sites for clients using themefofest templates. I love the envato marketplace toolkit that allows you to update your themes from within your site. The only problem is, clients rarely actually do this because they are busy, this ends up leaving them vulnerable. I would like to be able to click a button and update all the sites I maintain, I’m wondering how feasible this actually is? I don’t know enough about plugging development, but I know there are other similar services that do this with normal wp themes and plugins. They accomplish it by installing a plugin on the Clients site that has access to update their resources and links to the management sites backend. @valendesign Is this possible? By the way, I love the plugin, it’s made a huge difference already!