Your clarification does help, and I think this is a good idea.
Note - you can already do something fairly similar to this with the medical history summary report (though not nearly as easily and without the focus on timeline).
But you can construct a report for just a specific concern. Unfortunately - you cannot effectively safe this work (hopefully for healthframe v3.0.3 I can fix that) - but you can view it and print it.
Thanks for the great suggestion!