A first try for a dedicated pie for workspaces in Blender 2.8.
you can download the pie addon here
- Start Blender and open User Preferences. Click on the addons tab
- Click “install from file” , then choose downloaded zip or .py
- Check the addon to activate, then save user preferences
- Add the workspaces, 2D , masking , motion tracking by pressing the + button in the workspaces tab
- save as startup file
To use , ctr+alt+W
Hope you will like it !!!