Have you done whoopie slings? If so just make a long whoopie sling. It should be adustable from about 90-93 inches to 100-105 inches. Somewhere in there is the length that is right for you.
I did exactly this for my eno dn. Just one really large whoopie sling. I may make a non-adjustable ridgeline in the future, but the adjustable one is nice to play with the length and figure out what is comfortable for you.