Getting back on topic, would a POD in 1712 allow the Duc d'Orleans (aka Monseigneur le Regent) to live longer? Cause to me he seemed to have Louis XV's best interests at heart, unlike the Duc de Bourbon. So maybe this could lead to a better relationship between the Bourbon main line and the House of Orleans. Also, who would the Duc de Anjou (OTL Louis XV) marry in such a scenario? An Austrian Archduchess? A Bavarian Princess? Or maybe a Saxon bride?
One needs to remember in 1712, Berri bon-Coeur was still alive, if he lives longer, HE will be Regent rather than Orléans. That said, Berri, according to Antonia Fraser "if the crown fell on his head, it would fall right off again", so he might be the nominal head of the Regency, but his father-in-law might be the brains in a secondary position.
As to OTL Louis XV marrying, a Lorraine princess might be the least flammable option in Europe. There are no Austrian/Bavarian princesses of suitable age (since by 1712 Karl VI still had no children, and Josef I's daughters won't be engaged to a Bourbon). And Saxony has no princesses until the mid-1720s.
Also, I wonder if Marie Leszczynska will rather marry the margrave of Baden, which would still tie her indirectly to the French court (since Baden's sister was the Regent's daughter-in-law). Baden wanted to marry her, only to lose out to France. AFAIK his mother was supportive of it, but then settled on Maria Anne of Schwarzenberg when it became clear that France would win.
The only loser I could see is D. José I of Portugal, since if la reine-infante marries TTL Louis XV he'll need a new queen. Maybe his sister Barbara marries Anjou instead of Ferdinand VI who gets consoled with another of the OTL Regent's daughters.