Hi: Sure; why not. Giulio Andreotti who was Prime Minister of Italy
collected covers from the Papel States from the 1st of january to
the 31st of december 1870. All with their respective date cancels.365 covers ,not bad.
If I were to do what you have in mind;I would collect the stamps on covers only.It would be much more interesting in terms of the search
and philatelic appeal.My thoughts..