Losing the Google reader was a big deal for me, and I managed to write a Chrome extension that re-used most of Google Reader's UI and hijacked browser's XHR to redirect requests to browser background page.

https://chrome.google.com/webstore/detail/local-rss-reader/c...

The code is not pretty, if I wrote this extension today, the code would be much more readable and robust.

It worked out okay, but I moved to tiny-tiny RSS a few years ago, so this little project of mine is mostly abandoned.