Although I've never done this, I've heard it works wonders. Since I taught Tweets for a few years, I ran across several folks who had a little difficulty with Acro... and the hot, loud, uncomfortable, vibrating twin jet with off-axis seating.
Anyway... you know those merry-go-round things you find on children's playgrounds? They're round, they rotate on a center post, and they usually have several handles that rise vertically from the perimeter, and then turn diagonally down towards the center. Kids hang on the handles, run in circles, and then hop on. If you move towards the center, the whole thing spins faster, as you move towards the outside it slows down (conservation of angular momentum, for you physics types).
What you want to do is lie down on one of those on your back with your feet towards the center, and your head near the outer edge. Hook your legs or feet around one of the handles so you won't be thrown off, and have your buddy spin you around. Look up at the sky - - yepp, it'll make you dizzy. Keep your eyes open and start doing situps as you spin around. As you change the orientation of your semi-circular canals and accelrate/decelerate the spinning, your inner ear will go nuts, and your stomach won't know what hit it. Spin and do situps until you puke. Then do it some more... until you puke... then do it some more... until you don't puke. Go home, eat dinner, lather, rinse, and repeat.
If you can get your stomach and inner ear used to that sort of manipulation, a little training ride in bumpy air should be a piece of cake.