So I've always been interested in the Bourbon restoration and have read/post many threads on the subject over the years but I never remember seeing this brought up before. Everyone who's studied the era can pretty much tell that it was Charles X's policies that brought down the dynasty. So what if Charles X died before the restoration? When doesn't matter but lets say 1811 or so. That leaves his son Louis-Antoine, Duc d'Angoulême as heir presumptive and King in 1824. From what I remember Louis-Antoine's views and politics were quite similar to Louis XVIII, so realistically he would continue the moderate-conservative position of his uncle. However, his wife was Marie-Thérese Charlotte, the ultra conservative surviving child of Louis XVI and Marie Antoinette. Madame Royale was definitely the one who wore the pants in the marriage, so she could just as easily advocate the same policies as Charles X did OTL. Though I will say that even she thought her father-in-law went too far by making the Prince de Polignac the Prime Minister and in issuing the July Ordinances so she might not encourage something as far as Charles X. Maybe only the Anti-Sacrilege Act.
So would the absence of Charles X's reign be enough to properly secure the Bourbon restoration or would they still lose the throne again?