AH Challenge: Either Arthur II or III of Brittany becomes King of England

Upon doing research for my King Arthur I TL, it came to my attention that the Dukedom of Brittany had been ruled by two other Arthur's in the 14th and 15th Century. Arthur II (1261-1312) and Arthur III (1393-1458). Both had a great deal of Plantagenet blood, but both seemed far enough down the line of succession to ever been considered a legitimate claimant to the crown. Can anyone think of a plausible scenario in which either might have ascended to the throne of England? Please discuss;)
 
Upon doing research for my King Arthur I TL, it came to my attention that the Dukedom of Brittany had been ruled by two other Arthur's in the 14th and 15th Century. Arthur II (1261-1312) and Arthur III (1393-1458). Both had a great deal of Plantagenet blood, but both seemed far enough down the line of succession to ever been considered a legitimate claimant to the crown. Can anyone think of a plausible scenario in which either might have ascended to the throne of England? Please discuss;)
considering Arthur III was THE nemesis of the english crown OTL during the latter part of the HYW, the reaction of the english people would be interesting... in the chinese sense.
 
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