Forget about servos and pneumatic cylinders. You can have the sensation of shifting g-forces by just adding a few electrodes below your ear and applying some direct current. It's called galvanic vestibular stimulation. At the voltages usually used it should be completely safe to use. Currently it's easy to get sensations of gravity shifting to the left or right, but front, back and upside down still require a lot of studying and probably individual calibration.
Well, we need standardized dev supported data from the sim, and then the motion folks can figure out themselves how to translate that data into their favorite method