Louis XV dies before 1723, leaving the throne disputed between his uncle Philip V of Spain and his cousin once removed Philippe II, Duc d'Orléans. Orléans' death in 1723 could lead to dispute between his son, Duc Louis d'Orléans, and son-in-law, the Prince of Conti, and kinsman the Duke of Bourbon. Philip V's abdication of the Spanish throne in 1724 could work both in his favour or against him; ie, he could either make a full bid for the French throne and abandon the Spanish entirely, or he could attempt to take the French throne as well as the Spanish one upon the death of his son, Luís I. Other close relatives, such as James Francis Edward Stuart, being both grandson of the princesse Henrietta Maria and heir of the traditional English claims to the French throne, could be put forward as potential claimants to the crown by one or other political faction. Religious concerns, greed, court politics, dynastic considerations, Papal and foreign involvement, could all be brought into play causing internal civil war between various French factions, either supported by or fighting against Spanish aggressors. The death of Philip V of Spain (either prematurely or on the historical date of 1743) could lead to conflict between his sons, King Ferdinand V of Spain and Charles, not only over the French throne but also over the family's Italian possessions.
Between them, with foreign aid or support, I'm sure something awesome could be worked out.
Ie, James Francis Edward Stuart supported by the Duke of Bourbon and other French nobles opposed to both the Spanish and Orléans. Orléans supported by the English who have no wish to see James Francis Edward empowered in any way shape or form. And the Spanish, by brute force, managing to wrest for themselves considerable swathes of land on the fringes of the Kingdom, either to add to Spain or to set up as an independent feudatory for a younger son. Remember how in medieval times two Kingdoms of France existed? The real one comprising pretty much all of modern France, and the mostly titular one held by the Tudors, comprising the Pale of Calais and very briefly the city of Tournai. So something like that could happen, with the opposing claimants disputing the title amongst themselves and all presenting themselves as the sole true Kings of France.