Request for Implementation: A Classic Jupyter Notebook extension for easy switching between lab / retrolab / classic notebook / nteract

I’m helping move a big class (~1200) students to retrolab next semester, and one of the important parts is the ability for students to easily switch back and forth between the various UIs while viewing the same notebook. This is already possible in retrolab (although the ui could be better).

I would love for a classic notebook extension that will:

  1. Add a dropdown (or similar switcher element) to the toolbar of the classic notebook
  2. This list is populated with other applications that can open the same notebook installed
  3. When user selects another application, we save the current notebook, and navigate to the other application in a way that it opens the current notebook.

Anyone up for building this? Or maybe it already exists?