[Zope] structured text and css

We use structured text in a number of places where we'd like a bit more control over fonts, layout, and spacing than the defaults provide. And we don't want to clutter up the content with markup (for example <div>..</div> with embedded CSS styling.) It occurred to me that a simple solution would be to give a structured text object to have a 'css' property which give the URL of a css style sheet with pre-defined classes for the structured text, and modify the rendering product to reference the stylesheet and associated classes if it is present. A quick google didn't turn up anything in the archives that seemed relevant. Has anyone done anything like this?