The line I found (I don't know about its reliability):
Alexandre, comte de Ribeaupierre b. 1783 m. Ekaterina Mikhailovna Potyomkina
Jean François, Graf von Ribeaupierre m. N
Marc-Etienne, comte de Ribeaupierre m. Elizabeth Coster
Johann Jakob von Rappoltstein, Graf von Ribeaupierre b. 12.02.1598 m. Anna Claudina, wild-und rheingräfin von Kyrburg (Katharina Agathe's parents)
The descent from Johann Jakob, Graf von Rappoltstein aka Jean-Jacques, comte de Ribeaupierre seems rather unlikely as it was precisely his lack of sons that led to Rappoltstein passing to the Palatine Wittelsbachs, through his daughter's marriage to one of them.
If he had a son, it must have been an illegitimate one. But more likely is it that the Russian De Ribeaupierres are descended from a way more junior line which settled in Switzerland, or most likely, not related to them at all.
Though I guess descent from the Lords of Rappoltstein, whom the Holy Roman Emperors had invested with
das Pfeiferecht, the Right of Piping, a benefice that included supervizing, taxing and protecting the vagrants, vagabonds or travellers of the emperor (pipers, jugglers, fortune-tellers, singers and other travelling entertainers), including crowning a King of Pipers, would have been perfect for Felix Yussupov!