I modified my own one up, took a slingshot 2009 bar with a 2005 chicken loop & rope. Swivel above the bar running via a pully to avoid excessive wear, loop on one front line so i can land (however slingy oh-sh1ts can do this). It means i ride suicide but when unhooking its the only way.
The problem with i have found with the depower under the bar is too many ropes running through middle of the bar & the ropes wear quickly. By running the big slingy rope there is only one, i coat it in wax & is looking good still after a season.