Forget the idea of down force from under a Pulsar it just cant and wont happen. ALL the angles are wrong for this to happen. Unless you can fit a flat floor from front to back get all the crap out of the way and set it at the right angle.
All we can do is try and stop the rear bumper collecting air. So it would have to be a mixture of front spoiler a rear undertray and cutting some of the bumper away to let the air out. Look forward to seeing what people get up to. Even a front undertray would help.