Here are my ideas in alternate migrations:
- Anglo-Saxons move to Northern Spain which will be used against invading Umayyads
- Lombards settled in Illyria instead of Italy
- Avars pushed out by Bolghars and settled in Italian Peninsula
- Visigoths settled in Northern Gaul
- Franks settled in Southern Gaul, then invades Iberian Peninsula
- Jurchens settled in Danube
- Berbers settled in Egypt