Multi-site RSS feeds?

Hey guys,

I run a multisite for my school. There are four sites in whole (main, elementary, middle, and high school). What I would like to do is create three different feeds (elementary, middle, and high school) on the main page. I’m using post indexer and tag feed. I saw a recommendation by Arun to use the RSS in Page plugin.

Is there any possibility of you guys creating a similar kind of plugin that is a bit more user-friendly? Something that I could either embed via shortcode or widget?