Giving it to another nation is probably out of question - the Prussians have interests elsewhere, the Southern German states can actually be happy if they keep what they have, after all they grew tremendously under Napoleon.
Austria could be an interesting idea, as it guarantees that both Austria and Prussia directly border France and thus are more likely to oppose a future French expansion. After all, the purpose of the Congress of Vienna was to establish a new balance of power and for that, one had to curtain France. Adding Austria to that could be sensible - but I doubt that the Austrians would have any interest in that.
So independent Alsace is the most likely solution to get it away from France. There's enough dynasties around which could get it, and there's plenty of possible PODs that allow for even more families to loose thier lands - say Murat stays away from Napoleon and keeps the Sicilies, you'd need to reshuffle Italy, probably leaving the odd Hapsburg or Bourbon sideline without lands.
As already stated above, Napoleon being more successful in his 100 days points out that France is still a threat and likely implies a harsher peace, maybe loosing parts of French Flandres, Alsace, Corsica, something of those. Even after loosing all of those, France due to its high population would still be a great power.
Austria could be an interesting idea, as it guarantees that both Austria and Prussia directly border France and thus are more likely to oppose a future French expansion. After all, the purpose of the Congress of Vienna was to establish a new balance of power and for that, one had to curtain France. Adding Austria to that could be sensible - but I doubt that the Austrians would have any interest in that.
So independent Alsace is the most likely solution to get it away from France. There's enough dynasties around which could get it, and there's plenty of possible PODs that allow for even more families to loose thier lands - say Murat stays away from Napoleon and keeps the Sicilies, you'd need to reshuffle Italy, probably leaving the odd Hapsburg or Bourbon sideline without lands.
As already stated above, Napoleon being more successful in his 100 days points out that France is still a threat and likely implies a harsher peace, maybe loosing parts of French Flandres, Alsace, Corsica, something of those. Even after loosing all of those, France due to its high population would still be a great power.