AHC: Celtic "England", Saxon/Germanic Scotland & Ireland

I had this cool idea, I thought it would make for a good AHC: make England (as in roughly the territory of OTL England) Celtic while OTL territories of Scotland and Wales become Saxon/Germanic.

Some further rules:
- England/Albion should be united to a single state instead of petty kingdoms
- England/Albion can be Romanized/be a Celtic WRE remnant
- England/Albion can conquer Scotland/Ireland
 
The Crisis of the Third Century leads to a permanent division of Rome and during the Age of Migrations, the Gallic provinces fall to a germanic tribe and from there a native Celt is proclaimed/declares themself Imperator and so as a result of them being unified leads to later germanic invaders to focus on the more northern parts of the island eventually establish picto-saxon kingdoms in the lowlands, leading to a germanic 'Skotland'
 
The Crisis of the Third Century leads to a permanent division of Rome and during the Age of Migrations, the Gallic provinces fall to a germanic tribe and from there a native Celt is proclaimed/declares themself Imperator and so as a result of them being unified leads to later germanic invaders to focus on the more northern parts of the island eventually establish picto-saxon kingdoms in the lowlands, leading to a germanic 'Skotland'
Wouldn't it be easier if following the Roman retreat, some Romano-British warlord consolidates power on the island by keeping whatever Roman establishment intact? He would rule only part of the Britannia province at first, but a state based less along tribal lines and more on an organized Roman establishment, it could rise to prominence, especially during the Saxon invasions. If the various petty kingdoms manage to throw back the Saxons, they could be united under this Arthur-like figure as High King.
 
Either works, really. So long as the Romans are still in living memory, the warlord can play of complaints about legitmacy as them 'just continuing Roman Brittania'. 440 is the last window of opportunity for a stable state to arise from such a warlord. The Romans left in 410, so anyone half-decent at propaganda can claim their rule is restoring order, and are no longer in a position to re-invade but would still be easily remembered by much of the population.
 
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