OK, I'm late coming into this, but I'm going to suggest a different approach to autocrossing. Please keep in mind that I've only autocrossed once in the last 20 years (I don't care for it) so take my advice FWIW.
Let's understand a little more about what swaybars do. They do limit body roll, but you must ask yourself the question "what does this do for me and why?"
Body roll does nothing to change total load transfers. What swaybars do is speed up load transfer. While this is not necessarily important on a road course, it's tremendously important on an autocross course where you must change directions much more quickly than on a road course. So, speeding up and stabilizing the load transfer is very important on a autocross course.
If you are serious about autocrossing, I'd not only change my alignment at the event, but I'd change rear springs as well. I'd go with a big front swaybar to help with transitions. I'd get a really bit rear bar and run toe-out in the front. Lastly, I'd get some seriously high rate rear springs to make the car rotate.
This set-up would be downright dangerous anywhere but on an autocross course, so if you got this route, you must make your changes at the event and change springs and alignment back to your street set-up before leaving.