I want nothing more than to see the two of them swap bodies for a day since the two of them are complete and utter opposites, especially when it comes to their life styles. Maybe it could be like Freaky Friday and a fight causes a wise person to curse them to see how the other lives. Either way it's gonna be hilarious.

++ Leia in Han's body trying to diplomatically trying to get herself out of trouble. And the people who she is negioating with is freaked out that Han is talking in a calm and proper matter.
++++ Everyone at the resistance Base absolutely puzzled by why Leia isn't the calm proper lady everyone knows. For example with Han in her bodyshe curses at enemies, man spreads at meetings the works.
++++++ Chewie is the only one who realizes Han and Leia switched bodies and no one believes him.
+++++++ This takes place during their separation and spending the day as one another is a driving force that brings them back together in an au.