With as late a POD as possible, make the Iberian peninsula an Orthodox Christian region, with the Pyrenees as the frontier between Roman Catholic France and Orthodox Spain.
I don't really understand that : do you mean an Christian spanish king suddenly decides to turn Orthodox by claiming domination on Greeks? That seems unlikely.Would it turn out like in Russia, where there liturgy was more like the original until the Czar decided to update it for future goes at claiming dominion over Greeks?
Assuming we're talking about a period where Orthodox is defining Greek rites as irremediably different of Latin's (so not before the XII century), they were limited. Mostly trade, while religious ones were virtually non-existent.What ties would the Iberians have with the various Orthodox?
Make the Late Visigoths (say ... ~550) convert from Arianism to the Othodoxy claiming the patriach in Constatinople their religious leader, instead of the Pope in Rome due to some PoD'ish disargeements with him (might merely be the fact that the Pope is to close for comfort while the Pathriach is nice and far away and might not demand more than lip service)
Well, of course, there wasnt a real split between Rome and Constantinople yet, but, yes, the Iberians could deny the direct rule of the Pope. Later, that could end with them being labelled Orthodox.