An interesting idea, but I need a little direction on how to implement this workflow. ie, Where to install it, how does Safari know to run it automatically?

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This doesn't work the way you're thinking.

An automator workflow is a document for the application Automator. You can put it anywhere on your hard drive. If you double-click it, it will pull up the automator application. Hit the "play" button, and off it goes to do its magic.

An easier way to use this... Load it in Automator and "Save As." When Saving, choose to save it as an Application, rather than a workflow. Now you have an application you can doubleclick, and off it goes (rather than loading Automator and pressing play, first.)

This still doesn't solve the issue you want... automatically running it. You could make the application version one of your login items. I'm sure there's other ways as well. Perhaps someone else will pipe in with suggestions.