WI:Geoffrey Plantagenet marries Bertha of Brittany

I had been itching to make a timeline with the White Ship not Lost TL, is it possible for Geoffrey Plantagenet to marry Bertha of Brittany instead of Empress Matilda if William Adelin survives, and how would France react if Brittany and Anjou merge?.
 
Geoffrey would probably spend a lot of time enforcing his rule in Brittany against rival claimants, diverting his attention from Anglo-Norman - Capetian relations.

Would be interesting if his son still married Eleanor of Aquitaine and founded an Angevin Empire regardless.
 
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