Alt Henry isn't born until 1498, but I take your point.You could have Cecily’s children with John Welles survive, in particular Anne (b. 1491), the same age as alt Henry and heiress to the Welles estates if she were to survive.
Burgundy wasn't a kingdom either, and Juana still married Phillip OTL....Savoy is NOT a Kingdom and the English King has already a son… As much I like your tree I can not see Henry VII being able to get Juana as second wife with him having already a son and an unstable Crown
Henry VII ruled in his own right so any Yorkist blooded would be good enough. Anne is engaged to Thomas Howard but I guess who he could accept the switch to Katherine.
Oh, I agree this probably isn't a realistic tree . But I realised that no one had ever suggested an Anne of Brittany/Philip the Handsome match, so I was playing with that, and then wondered what to do with Juana, if her OTL husband was taken... As I said, I never really thought it through fully, it was more of an abstract half-idea...