I wrote a similar tool (but not as polished) that requires you to write custom plugins. This works well if you have websites that are hard to scrape in an automated way. Maybe it's useful to someone else: https://github.com/dewey/feedbridge
You could in theory combine some, but it was just a very specific use case I built it for. Just a fun project, and on Github in case anyone else has a similar niche problem.
