Louise Élisabeth "Babette" de France, eldest daughter of Louis XV, wife of the Infante Felipe of Spain, and mother of the duke of Parma, and the queens of the Romans and Spain, was scheming with Empress Maria Theresa during the Seven Years' War (around 1757), to have her husband named ruler of the Austrian Netherlands, in exchange for which he would cede the duchies of Parma etc back to the Empire.
Now, Babette died in 1759, and her husband was too unambitious to ever angle for a throne of his own. But what if somehow that Austria had traded the remainder of the Burgundian Inheritance (which had by the 1740s/1750s become little more than an albatross around their neck) for Parma (which might end up being united either with Tuscany or with Modena). And what effects might this generate not only amongst the Spanish Bourbons (Isabella Farnese was still alive), but amongst the French Bourbons and Europe as a whole?