If Napoleon, upon his return, made it expressly clear he would abide by the terms that Austria and Britain demanded I could see them accepting him as the Lesser of Two Evils in the face of Russia running roughshod over everything. At the very least, if he returns once the fighting has already started there will be a small window of time where the two of them won't be able to fight both him and Russia and they're already fighting Russia.
This could be an interesting way to get Napoleonic France and an Independent Poland without a France Wank. Of course the most difficult part is still Napoleon's Personality, namely getting him to actually accept such a vastly reduced France.
However I don't think that is impossible. His Defeat and Exile could be a good way to inspire him to do some honest "Soul Searching".
This could also lead to the most awesome Dream Team in Military History; Napoleon, Wellington, and Archduke Charles, on the Same Side. Although that sounds less like Plausible Alt-History and more like a Buddy Cop, er, Buddy General Movie..
Charles: "Okay Napoleon, we've had our differences, and I just want to be clear, we'll be doing this By the Book. Okay"
Napoleon: "Aw Hell Naw, the only Rules I follow are my Own maaaaaaan."
Wellington: "When this is Done, I'm takin' Both your Bicornes, Ye'hear?"