If the Star is on time, it is scheduled to arrive in Kissimmee at 10:55 am and the Meteor is scheduled at 12:45p, This is a 2 hour window, if the star is running late, then I would just wait in the station and eat on the train.
The several times that I have done the points run from ORL to KIS, the Star was never real late. The Meteor was more often late. I always had time to spare after eating lunch and walking around.
When are you going? It can get warm sitting out and waiting for the train in KIS. The KIS station is pretty small with limited seating, however, I assume if you came in with a cane, someone would give your their seat (at least I hope so).