A more culturally Welsh Isles.

I understand that Welsh political dominance over the British Isles is completely impossible but would it ever be possible to have a more culturally Welsh Isles? It doesn't matter which nation or nations control the Isles as long as its more Welsh culturally than OTL. I feel like this has a very small possibility of being pulled off during the migration period though I could be wrong.
 
If Ambrosius Aurelianus (or his successors) managed to develop a working Romano-British system capable of resisting further Saxon incursion after Badon Hill,* the culture we now refer to as "Welsh" would probably have more of a chance.

*Assuming Gildas's account is accurate or real
 
My understanding is that, contrary to the mythology of the English being an "Anglo-Saxon race", most Englishmen are largely of the same Celtic origin as the Welsh, and that what distinguishes the two is that the English underwent a language shift to Germanic while the Welsh continued to speak their indigenous language.

The question then is, why did this language shift occur? Neither Latin nor French fully took root in England after the Roman and Norman conquests, respectively. What did the Anglo-Saxon conquerors do to get the common people to adopt their language? Whatever it was, try to butterfly it away and have the Anglo-Saxons eventually adopt the language of the people they conquered, rather than vice versa.
 
I think that the Anglo-Saxons didn't just establish themselves as the new overlords but also had farmers etc. which led to a greater integration of the Britons who remained. Have them just establish themselves as the new aristocracy as per Normans and the language and culture of these islands would be more Brythonnic especially in the north and west. Of course the Norse and Danes could mess this up if the knock ons and butterflies didn't change their occupation of parts of the island.
 
It would be helpful if the Briton leadership ended the practice of equal inheritance which was an important factor in weakening the kingdoms and making them more susceptible to Saxon conquest. Coel Hen was a prominent Romano-British ruler installed by Maximus who ruled over northern Britain but his kingdom was divided amongst his sons upon his death. Have him establish a system of primogeniture and northern Britain at least would remain under a single ruler. The Coelings quickly revert to a Welsh culture.
 
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