Yes, the question is in the title.
I'm looking for a way to exchange characters between savegames.
Example: I want to replace the mage on savegame A with my new mage from savegame B.
Something like this was possible in Baldurs Gate II Multiplayer where you could import and export characters from your savegames and even save them as unique character files.
I had alot of fun with that feature and would love to have this in Original Sin.