As I've just posted to St. Lucifer, I agree. The Christians should start with Asturias not Leon in 720. Better then to have Al Andalus start at the same time for balance but with 80% of the land area (historically accurate).
As far as starting in Morocco, that would put the date back 50-100 years,
esp. for the start of the Umayyads in the Middle East (660?)
Better to start Al Andalus in place in 720.
Morocco would be ruled by the Umayyads up to 750,
then by Cordoba until the invasion by the Almoravids in 1086.
So Andalus and Asturias both starting in 720. Nice and simple and accurate.
That'd prob. work OK. Do you agree?