like a wiki-blog? But then, when is a refinement to something a new work (like a part 2), a small refinement to the original, or a noteworthy modification e.g. such that subscribers would be notified of the change?

You don't need dated entries, just a topic name, a few subheadings for different parts of related text, and a history page; but presenting update notifications can still be a problem? maybe different levels of notification, or subscribing to specific articles(subheading)/topics?