juana la beltraneja

What if both Isabella of Castile and Juan, Prince of Asturias died in 1490 and Juana la Beltranjea accepted Ferdinand II’s proposal to marry him (made by Ferdinand for keeping control of Castile)?

I saw a thread on this topic from years ago but I want to renew the idea. What if Juana la Beltraneja, daughter of Joan of Portugal and (possibly) Henry IV of Castile was a boy instead of a girl? I imagine that little Juan would not marry his uncle Alfonso of Portugal due to the very obvious...

So I am currently reading a biography on Isabella I of Castile and it mentioned that the good ol'La Beltraneja was at one point, betrothed to King Louis XI of France's brother, Charles, Duke of Guyenne. However, Charles died not long after the betrothal was made and so Juana would be betrothed...

Since Fernando displayed interest in marrying either, let's say Isabel dies before they're wed (maybe around the same time as her brother, maybe she's killed en route to wed Fernando, either way, she's making like a doornail - my reason for this is simple: no power on earth will make her wed...

However you like, make it that Juana 'la Beltraneja' succeeds her father when he dies. Rules: 1) Isabel of Castile is not allowed to be killed in order to make this happen. 2) Any of Juana's ill-fated husbands/husbands-to-be may survive though - the king of Navarre, the duke of Guyenne or the...