I haven't bothered reading the full thread (that's freaking 1400 posts), but as B5 is considered unknown in pretty recent threads that grew a little slower
and is not filled in here yet, I suppose I may have some useful information.
A search on Wikipedia strongly implies (I haven't done the work bothering to go through all of history, as they lack a single list with all nations that ever existed) that the
only nation that ever existed that would aphabetically fit between Germany and Greece would be Ghana, or the Ghana Empire that existed somewhere around 300-1200 AD, also known as Awkar. Now, that's also the biggest problem here - would they use Ghana Empire, or Awkar? I would myself think Awkar, but that would mean there's nothing alphabetically between Germany and Greece, so I'm going with Ghana Empire all the same.
https://en.wikipedia.org/wiki/Ghana_Empire