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I've looked at Louis XV's daughters, and found some possible husbands for them. I realize that some might be regarded as a waste since those states were maybe already allied with France.
Louise-Elisabeth stays married to the Duke of Parma
Henriette-Anne marries either the Duc de Chartres (refused by Louis XV since he didnt want the house of Orléans to grow so powerful as it had been under the Regency) or become second wife to Ferdinand VI of Spain (also refused on the grounds that 'the French people abhor incest' [ironically he used the same excuse when offered Maria Antonieta as a second wife for the Dauphin]
Adélaïde marries Maximilian III Joseph rather than Maria Anna of Saxony (maybe she'll give him children).
Victoire can marry Ercole III d'Este, Duke of Modena (let the Comte de Soissons live longer, thereby rendering Maria Teresa Cybo Malaspina unavailable).
Sophie could maybe catch Karl Theodor (and much like Adelaide provide him with legitimate children that were sadly lacking).
Louise-Marie was proposed as a match for Bonnie Prince Charlie (but refused saying 'Why are all so obsessed with finding a husband for me, when I want none but Jesus Christ?')
It's just a crazy idea I had. But I was also thinking that the removal of Mesdames Adélaïde, Victoire and Sophie from Versailles could perhaps mean a less vindictive environment for Marie-Antoinette when (and if) she arrives.
Feel free to critique it and comment and make suggestions.