HELP - Greek Family Names in Greece, Romania, Australia & New Zealand

I have my own rules for entering names in my own genealogy program. But Geni is global and collaborative. Hopefully I can get some guidance here.

I now have 3 or more cousins all collaborating on our extended family tree. We are all related in some way to Gerasimos Polimeris

Following the lead of the Bible Tree, I think we should add names in English / Greek in the display name. That is fair to everybody and gives us a chance to be found by cousins in the future.

However taking Gerasimos Polimeris as an example. His family nickname was Mima or Mema (I have no idea about the greek). In Romania,his name was written formally as Gerasimos Polimeris. In Greece (where he died) it was written Γεράσιμος Πολυμέρης and latinized Polymeris with a Y. When talking about him he is Πολυμέρης (Polimeris) when talking to him directly he is Πολυμέρη (Polimeri)

So some of his closest relatives have names entered as Polymeri, Polimeri, Polimeris, Polymeris. Don't even start on maiden names in that family.

If I understand correctly, the current suggestion is English Name / Foreign Language Name and every variant in the Nickname field. Is that correct?

If so then I think the closest family relative can pick the First, Last and Display name field.

What do you all think?