So...A bit of a fun/cute idea... But a Malfoy-raised Harry (good!Lucius, obvs), having a nack for dancing.
Especially for dances of the older era, I.E: Swing, Cha Cha, Lindy Hop, etc.
Now, Harry would be going to Ivermony, and would replace Durmstang in the Triwizard Tournement.
I also like the idea of the other schools basically choosing their champions before they even left, either by raffle or by competition.
Now, to get back to the dancing part, Harry would be the one to ask Fluer first, and due to his ability to throw off her Alure, she would say yes.
At the ball, after the First dance, Harry would win her over, with different dances, from different countries.
For me personally, i would say that Voldemort stayed dead, when he tried splitting his soul again that Halloween night.