I think that a secondary object FindDupes dialog might be preferable.
Or maybe an option to clipboard a list of IDs for the Events (Citations, Notes) of the merged person (and Family events) for that person? The list of IDs can be pasted into a (freshly reset/cleared) Events Filter Gramplet’s ID (and using RegEx). This would give a sortable Events view that would simplify finding mergable Events.
Also a list of Families of the Potentially Duplicate persons has potential. Because a Family Merge can process 2 sets of 2 duplicate people at a time.