Know what? Setting up a standalone page is no problem at all. You can just go here to use it: http://kzeni.com/gb-chat-cloud.html (no coding required). I've updated the main post.
I simply saved the chat page's source, added the script to it, and uploaded it. You can still use the console trick if you want to be on the official GB chat page.
*EDIT* I've updated both the code snippet & the live demo page so that there's an auto-refresh button now. Also, did some refinement to the ignored words.
*EDIT #2* I've added a bookmarklet to the demo page so you can apply this to the official chat with a single click. Restructured the original post as well to include these updates.