The answer to Can we have a RSS feed based on a particular user's answers, comments, and/or upvotes? shows how to get a RSS feed with a particular user's questions and answers on a particular site, through the "user feed" link at the bottom of the profile page on each site.
However, I would like a RSS feed that aggregates all my questions and answers across the network. Something like a RSS version of the Activity -> Posts tab on StackExchange.com. I tried the obvious of adapting the URL to use the stackexchange.com domain, but only got a not found response back.
Does something like this exist, and if so how do I access it? Or would I have to cobble something together manually by combining feeds from each site to achieve my desired result?