Half of the stances (Diurnal/Nocturnal + Fists of Earth/Wind/Fire + Kiss of the Wasp/Viper) are ones you click once and never touch again, meaning you could just move these to a hotbar/crossbar that's by itself. They're barely a button bloat problem. The only ones that actually need some thought are the MT/OT stances and Cleric Stance.
Also how is it convoluted? Convoluted means extremely complex and difficult to follow. These simple buttons are anything but complicated...
