Try this idea, Henry VIII's younger sister
Mary wed King
Louis XII. Louis died soon after. But what if his health had been marginally better and he'd have gotten Mary pregnant with a son?
That would leave the King of France a clamant of the Crown of England. Now
Mary Queen of Scots Henry VIII great-niece, had no qualms in marrying
Lord Darnley her first cousin, and a violent syphilitic drunk. So she'd have no problem marring a close cousin who was King of France. (Especially as the King of France she did marry was mentally handicapped and never when through puberty, Mary sure could pick them.)
So, in our world Elizabeth Tudor never wed because A) she'd lose all her personal money, due to clauses in her Father's will, and be brutally dependent on her husband, B) there was no man she could pick without causing a crisis, and C) she had Protestant options for heirs. In this setting C) is gone.
Elizabeth must marry quickly early in her reign and produce heirs. There will be a crisis.
This would be a game of conspiracy and swashbuckling in a highly glamorous setting.