You'll need something on the other account to parse the RSS file amigo...
Take a look at this excellent tool... http://magpierss.sourceforge.net/
Here is a technical article on how to parse RSS with php: http://www.sitepoint.com/article/php-xml-parsing-rss-1-0
And lastly, how to use Magpie: http://www.olate.com/articles/214
So, you just point it at the file that eZ Publish provides, and you're done. It's actually really easy (20-30 minutes, maybe two hours if you have to struggle through it I should think, but YMMV).