Thank you for all the great heraldry!
But... Flags and national coats of arms represents states. I think it is a fallacy to consider states Orthodox. Lands and peoples can be called Orthodox, if the majority of the population is Orthodox, but to call a state orthodox it would have to have a government that only ever makes "Orthodox" decisions and "Orthodox" laws. Is there such a place? Has there ever been? ...yeah, mount athos comes to mind, but other than that?
Perhaps the OP means for the display of flags and coats of arms represent the Orthodox peoples, but it is not really a correct way of using these symbols.
Sorry OP, just trying to help.