This is quite an interesting use case for the product. I am little confused on the actual function desired here.. and this might be the bleeding of different termniologies happenin.
Now when you say you want a 'Meta-dashboard' that shows 'historical dashboards' do you actually mean a dashboard, that has all of the historical worksheets on it. And then each of the 'Thumbnails' when clicked would navigate to that particular sheet?
If this what you were thinking I believe that the use of dashboard actions, and possibly something along the lines of what is done in the 'Creating a Table of Contents...' article that is attached below, would be the most effective route for the desired results. Additionally I have attached another article on the use of creating filters I believe would be greatly beneficial to the understanding of dashboard actions, and the power which they can unlock.
Product Help on the use of Dashboard Actions