If you do not want to spend money on the Minnie vans (best option) take a bus to Ft. Wilderness then an internal bus to Pioneer hall. After the show take a bus to an open park and transfer to a POR bus. Sometimes after the show there might be a bus to a particular resort but that's rare and usually after the 8:30 show.
Take the bus to Ft Wilderness from AK and then an internal bus to the Settlement depot. It is a short walk to Pioneer Hall. You can take the boat to MK and then catch the bus to POR from there after the show. There is also a bus to MK from the Settlement depot which will take you directly to the MK bus depot. You won't have to go through bag check if you take this route.