So the requirement is to post timed, links?
If it was just to post links to externally hosted content, I would recommend you use the RSS Feed widget. Its display is very similar to native blog posts. Those posts will show up shortly after the RSS feed updates though, and not dependent on a tagged, scheduled, process.
You could potentially create a new widget, based on the Blog Post List widget, which essentially takes the process you suggested (links in the blog post). The rendering of the post's title in the widget could be adjusted to use the body of the post as the href target instead. It would needed to be treated with care as it's somewhat of an unintended use of Blog Posts, but it could theoretically work.