This already exists in the individual editor: the presence or absence of a book icon in the column just before the padlock.
I also sought the opinion of a developer to see if this icon could be clickable and lead to the Events tab of the Combined View, which provides maximum information with minimum clicks.
https://gramps.discourse.group/t/quickest-and-easiest-way-to-start-a-tree/7123/30?u=bjc49
I’m probably repeating myself too, saying this isn’t feasible.
