Hi Mark,
Thought it would be useful to put up my thoughts on how you might use the Open Input. Don't think we're to far apart. I think your right about using a notification to flag input has been registered rather than tutor as I state. I also think the tab for what I term item 2C is interesting. Works well for mobile doesn't it where, due to limited screen size, you'd have to scroll up and down to see the pre and post user entries. On desktop I think I'd prefer to compare side by side but perhaps the mobile friendly tabbed approach is pay off worth making to ensure consistency.
Cheers,
Paul