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In OTL, Prince Charles Alexander of Lorraine, younger brother of HRE Francis, was married to Maria Anna of Austria (who died a year later after the marriage) and became the Governor-General of the Austrian Netherlands.
(en.m.wikipedia.org/wiki/Prince_Charles_Alexander_of_Lorraine)
My question is: What if instead of marrying Maria Anna and becoming G.G. Prince Charles is offered the title of Duke of Guise and Prince Etranger in the french court?