Why would they want this? Napoléon's wife is Austrian, his heir the grandson of the emperor. Metternich's role at Vienna is often GREATLY exaggerated - a fact that Metternich's own son commented on: "It suited my father to present himself as the man who SINGLEHANDEDLY had defeated Napoléon in the peace as what Napoléon had humiliated Austria in the war" (or something like that).
Alexander of Russia, as
@alexmilman pointed out, is such a clash of liberalism and conservatism that his personality is borderline bipolar. However, if his meeting of Madame de Krüdener is butterflied or delayed (he seems to have only met her AFTER Frankfurt but BEFORE arriving in Paris), then that means that the only dreamy eyed mystic at the TTL talks would by Friedrich Wilhelm of Prussia. Not saying Alexander WOULD be ANY more coherent in his policy, but lack of Krüdener might be as big a thing as removing Rasputin from Tsarina Alexandra's orbit.
Britain is the ONLY one who (at this point) really wanted Napoléon gone. And even some of their own politicians thought that this waa unlikely. So, quite possibly, Austria and Russia will sign peace treaties with France and politely ignore Britain's protests. And if the British object, I could see Metternich pointing out that "we [Austria/Russia] have to live next door to him [Napoléon], you are across the street [the Channel]. Its not YOUR house that he breaks into when he's pissed."