Clove hitching to a carabiner is a great solution. It wouldn't stress and pinch the rope like the descender rings would, but still allows for a fast easy pitch.
I have been teetering on buying a Hennessy to replace my ENO DN, but have been waiting because I wanted to find a fast and simple way to pitch and adjust the hammock, compared to the figure 8s that Hennessy recommends.
Solution found! Clove hitch to a carabiner.