If it is a typical length adjustable self tie, you could have someone else tie it for you, than unhook it in the back. It would then give the asymmetry you want of a self tie and the ease of wear of a pre tied. I imagine with a little ingenuity, you could put some kind of basting stitch in thru the back of the know to prevent it from unravelling, so it could be used over and over. Otherwise necessity would dictate going with a pre tied bow tie. Most every man there will be wearing one anyway, and IMO it is a better look than a conventional tie with a tuxedo. Current fashion trends be damned.