You also can't feasibly include Italy without perhaps 90% overlap in city-names with the Romans.
This is just not true. Here is the list of Roman cities:
Rome (Italy)
Antium (Extinct)
Cumae (Extinct)
Neapolis (Now Naples, no cross-over)
Ravenna (Could cause problems)
Arretium (Now Arezzo, no cross-over)
Mediolanum (Extinct)
Arpinum (Extinct)
Circei (Extinct)
Setia (Extinct)
Satricum (Extinct)
Ardea (Now a minor town, wouldn't be included in Italy list anyway)
Ostia (Extinct)
Velitrae (Now a minor town, wouldn't be included in Italy list anyway)
Viroconium (Extinct Roman Britain town)
Tarentum (Now Taranto, no cross over)
Brundisium (Now Brindisi, wouldn't be included in Italy list anyway)
Caesaraugusta (Now Zaragoza, Spain)
Caesarea (town in modern day Israel)
Palmyra (Extinct, ancient Syria)
Signia (Extinct)
Aquileia (Now a village of 3000, wouldn't be included in Italy list anyway)
Clusium (Extinct)
Sutrium (Now a village of 5000, wouldn't be included in Italy list anyway)
Cremona (Small town of 70,000. Unlikely inclusion)
Placentia (Now Piacenza, no cross-over)
Hispalis (Now Seville, Spain)
Artaxata (Now Artashat, Armenia)
Aurelianorum (Now Orléans, France)
Nicopolis (Extinct Greek city)
Londinium (Now London, UK)
Eburacum (Now York, UK)
Gordion (Extinct, remains lie in modern Turkey)
Agrippina (Now Cologne, Germany)
Lugdunum (Extinct city in Gaul)
Verona (Could cause problems)
Corfinium (Extinct)
Treveri (Now Trier, Germany)
Sirmium (Extinct, Serbia)
Augustadorum (Bayeux, France)
Bagacum (Bavay, France)
Lauriacum (Enns, Austria)
Teurnia (Extinct, Austria)
Curia (Extinct)
Fregellae (Extinct)
Alba Fucens (Extinct)
Sora (Now a minor town, wouldn't be included in Italy list anyway)
Interrama (Extinct)
Suessa (Now a minor town, wouldn't be included in Italy list anyway)
Saticula (Extinct)
Luceria (Now a minor town, wouldn't be included in Italy list anyway)
Arminium (Extinct)
Senagallica (Extinct)
Castrum Novum (Extinct)
Hadria (Now Adria, no cross-over)
So out of these, only 3 are a problem (Rome, Verona and Ravenna). Verona and Ravenna can either be moved over, or just left out. No big deal. Rome can be named Roma, or be excluded from the city list if the Roman civ are present (a la Honolulu), while Florence might be capital (feasible). A lot of the cities aren't even in the Italian peninsula!!
All in all, this is no barrier for inclusion of Italy.