I take something of an interest in uniform history, and really uniforms in general, myself.
If they had to take one of the patches off, I'd assume it'd be the All-Star patch, though placing the World Series logo on the chest, like they did with the Rockies vest, may also be an option... but the jerseys would look so crowded. That said, yeah... shouldn't be much of a problem.
That said, though... on the subject of jerseys, I know for certain the Royals will be wearing light blue alternates this year.