I've been looking for a solution to allow users to export dashboards as a PDF. I tried a POC with embedding a dashboard with on a VF page, but no luck. I've seen guides on how to embed specific components of a dashboard using the image servlet, but I'm looking for the whole dashboard. Rendering as PDF didn't work when I tried to use the ID of the dashboard in an iFrame.

The ideal solution would be a button to export the dashboard when viewing the dashboard. However, I cannot add custom buttons to a the dashboard page. Therefore, I have thought of this:
1. Visualforce page with a dropdown of dashboards
2. Users choose a dashboard, and click a button on the Visualforce page that triggers a download of that dashboard

Since I had no success with the dashboard in iFrame, I am wondering if this is even possible. How would I accomplish this?