How to have editorial templates used for multi brand sites

I have a site that will be launched for mulitple brands, but sharing content pages via MSM.

i..e the master site would be rolled out to different locales, and each of those locales may have multiple brands for the same content.

By setting the clientlib on the editorial template, I can't see how i can have each of the sites using the same content without replicating the content on each site.