UPDATE: No way. Disqus is far more annoying than CoComment can manage at its most quixotic. All the new comment systems require a move to the newer Blogger interface to work properly, which significantly reduces one's ability to control the layout of the blog.
UPDATE 2: Part of that may have been my fault. I may give it another whirl later. But it's not promising that the Disqus Appearance Settings page gives you two options: Preview and Cancel... the SAVE option is conspicuously lacking.