Sean asked “Question for you: Is it possible to replace the #Revit Recent Files page with custom HTML, either local file or online?”
There is no straightforward way to replace the Recent Files page (it is built at run-time by Revit). But here are two ways to show a web browser as part of the Revit session.
- A modeless, independent dialog with a web browser is showed when Revit starts
- A dockable web browser is created after the first Revit file is opened
Boost Your BIM 
Are you willing to share some of the code to get started?
Hi – Please contact me at https://boostyourbim.wordpress.com/contact to discuss.