Search box that can read includes

I’m running WP 3.0.1 with MultiSites and I have added a few default pages to be created every time I create a new site. I have added the plugin Exec-PHP that allows me to insert php code in the posts/pages. Since I want to be able to edit these default pages on the fly, i decided to do includes so that I only have to update the page once and not for every single site. The problem is, that since the text of the page is not on the database, it’s on a separate file (include) I don’t get any search results from the search box.

Is there a hack or plugin for this that anyone is aware of? I’d really hate to remove the search box, it makes the site look pretty plain.