Currently, there is only one weight-shift control trike made for flight simulation. It works with the Flight Simulator X program and it is a good overall model.
However, setting up the controls for a weight-shift control trike (WSC) is more challenging. If you flip the stick upside down and hang it from something above you where you can reach the trim plus build a control bar and attach it to the stick hanging above you, you would have a pretty good model for training or flying in a trike. The foot pedals could be programmed exactly like the trike, throttle/gas with the right foot, and brake with the left foot. With these modifications this would represent the trike controls very well and provide accurate controls.
Here is a video showing the WSC trike:
