Around 2009 I was helping build the new website for a popular german hardware online magazine. Back then the site was build with Joomla 1.5 and they were using vBulletin. They wanted to have a discussion exactly what you are describing above. Ability to comment both in the article and in vBulletin. So we've created an SQL stored procedure to update the database on new comment or on new forum post.
With that said, although I'm keen on doing something like this again (If I'm being paid) I don't really see the value in it for the ccomment users. If you really want to have a forum to discuss, then one can use the kunena discuss plugin + kunena. Why should ccomment be able to do what the kunena discuss is already doing? I don't like to reinvent the wheel over and over again.
What do you mean with structured moderation? When you open an article and if you are moderator you are able to delete the comments from the frontend with just a click?
Migrating the comments from kunena discuss is certainly possible but a little more complicated. The comments are not stored in a kunenadiscuss table, but in kunena itself. The kunena discuss table is merely just a mapping table of a content to a kunena post. So it requires few more queries to get everything that one would need.
Regards,
Daniel