Check out some of the other threads for answers to your questions. As a life-long resident of Missouri, I have never seen anyone open carry with the exception of myself. I have never been questioned as to why I was carrying but then again I live in a very conservative area of the state.
The problem with KC is you never really know exactly where the municipal/state boundaries are. With that being said, I would conceal carry (although that is the ******** answer until we can get the proper legislation passed). Missouri will recognize ANY out of state concealed carry license.
Good luck with your trip and keep on packing!!!