NCL has added an excursion that might be what you are looking for:
https://www.ncl.com/shore-excursions/CIV_90/Scenic-Rome-with-Transfer?destination=Extraordinary+Journeys%2CGreek+Isles+Cruises%2CMediterranean+Cruises%2CNorthern+Europe+Cruises%2CTransatlantic+Cruises&port=CIV&sort=searchWeight&sortOrder=asc&perPage=12&startingRecord=24&fbclid=IwAR08jnQWCtLCWZxltMC_Hght_5hJyJIfz2mrVM17LvD8gdG4IQezUszBD4Q