CS6 - add non-editable region inside editable template region?

Question

I have the following in a template:
    <div class="main-content">
<!-- TemplateBeginEditable name="main-content" -->
      <div class="content p7ehc-1"> <!-- from projectseven.com; don't change -->
        <h1 class="page-topper">Enter topic here</h1>
        <p>Enter content here</p>
      </div>
    <!-- TemplateEndEditable -->
   </div>
Right now everything in main-content is editable. I'd like to add "Page last revised - " at the bottom of the page which would be non-editable. An editable date would follow.
I already have a number of pages with content so any solution should not destroy the content of those pages. (If needed I'd be willing to manually add "Page last revised -" to each of those pages. However, I'd want this to be automatically added for any new pages that were based on the template.)
I have tried putting "Page last revised -" in another div and making it non-editable but this creates other layout problems. I currently don't want to explore this option further.
Thanks for any suggestions.

Answer 1

You could always drop a server-side include or even a Dreamweaver Library item into that editable region (the latter method is a poor second choice, though). Is that a reasonable solution?
Failing that, manually adding Ben's code both to the existing child pages and the current template will definitely place that code into newly created child pages. The beauty of his suggestion is that it's self maintaining, meaning that the code will always show the proper date on each page.