Display a count for number of pages with a specific region

On my site, I have a number of pages each with the same name region. I will be adding (and sometimes removing) pages and I want to display the number of pages as I add (or remove) them. Is there a way of doing this with perch_pages_navigation or do I need to set-up perch_content_custom with paginate = true and a pagination template variable like total?

Thanks for your help.