AH Challenge: Swap the fates of Iberia and the Balkans

Your challenge is to make a huge part of the Balkans be conquered by the Arabs during their expansion between 700 and 800 AD (Constantinople included) but be completely recovered by the Christians before 1500 in a long process of "Reconquista". In the other hand, the Iberian Peninsula must be the target of a later Muslim expansion starting in the 1300's and a part of it must still belong to a Muslim country nowadays. How could it be done?
 
Europe prays really, REALLY hard.

But seriously, if the Arabs overwhelm Constantinople and get into the Balkans, then isn't Western Christiandom doomed? Islam will convert the Rus, the Norse, and completely encircle "The West" (British Isles, France-Germany, Italy, and Spain).

Now I think that the flight of thousands (maybe millions) of East Romans to the west will have some serious knock-on effects, so perhaps some kind of stable political system (ie not the post-Charlemagne fratricide) will come into being. More centralized, less chaotic. So maybe this much smaller West can weather the Arab-Islamic storm, beating off the killing blow until the Arabs splinter at home and take the pressure off.

Off the top of my head I would say that some kind of more centralized Europe of this era will have to rely heavily on the Church, so I would expect a much more powerful church, along with a much expanded Empire. The East Romans will bring their regalia with them when they flee Constantinople, so the "Roman Emperor"- probably whomever the strongest Frankish lord is at that particular point is, gets that title.

With the East Romans' much more higher level of administrative know-how I would expect that they would quickly rise through the Church and Imperial hierarchy. They also might bring that later "Baliseus" (can't spell) idea with them, with the Emperor as the state, that is having unlimited power.
 
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You'd want a complete collapse of the Byzantines, just in time for the Arabs to sweep in and take the Balkans, along with the rest of Anatolia. Not sure about the second part.
 
The Romano-Berbers and whoever else of North Africa successfully resist the initial Arab invasion (this happened in Interference, I think). So the Arabs focus entirely on the Byzantine empire, and are able to completely eliminate it. They then invade the Balkans, but stall in OTL Hungary and Croatia. A more centralized Carolingian empire gradually reconquers the Balkans over the centuries.

As this is happening, a Mamluk dynasty takes over in Egypt (Muslim AIOTL). They then begin a policy of expansion to the west, overrunning north Africa which resisted the initial invasion. They launch an invasion against the decrepit Visigothic state (assimilated into the Romance Hispanic population centuries previously), and conquer the peninsula.
 
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