Note that Pontus is not here due to the fact it was not a Greek state yet at the time, but rather Persian. Although Greeks would settle in the region later on.
Maybe accept different type ins, for example Olfia/Olvia for Olbia? I learned it this way in school myself. Panticapaeum as well you should get different type ins for I think, it's very long and hard to get right.
Collab me and MasterRocket on a copy