Integrating ProSites with other multisite plugins

Is there a function or variable that would hold the list of blog ids matching a certain level?

Specifically, I'd like to try and integrate ProSite with another plugin, for instance:

I'd like the ability to turn off the global header and footer for pro sites. This particular plugin allows for a list of blog id's to be excluded. i'd like to update the plugin to pull the list from the list of pro sites automatically.

Alternatively, I could use the WPMU Global Footer, but there isn't a corresponding header (which I like). And it doesn't even seem that that plugin has an interface with Pro Sites (though I think it should!)