Read more and headline clicks redirect to original article?

I am in the process of building a multisite drupal site. The top domain will act as the portal and each subdomain will be about a specific topic. Instead of tampering with my database and using Domain Access or any other content sharing method, I was thinking of using FeedAPI and Feed Element Mapper to "syndicate" the content from the sub domains to the top domain.

I don't really want people to "stick around" on the portal. I want them to use the portal to find a article and be redirected to the correct sub domain. So I am not looking to create nodes (in the sense of hosting the content on the portal site). I just want the portal to act as a way for people to quickly get to the subdomain.

I checked out the demo and it seems that the feeds are converted into nodes and whatever content comes from the feed is placed on your site. Is there a way to make all "read more" and headline clicks go directly to the original article without the user "sticking around" on the portal.

Also, I wanted to know if their was a deletion method you can use. I really only want the most current feed items to show. I don't want to create thousands of nodes where the user can stay on the portal site.

Would drupal's core Aggregator module work better for this set up?

Thanks!