Some times it is nice to embrace technology. Stronger fibers, chemical baths, extrusion vats, thread spinners, and robot arms.
I love you cold, unfeeling robot arm...
Well, maybe not robot arms (it's just not Our Thing). But! Synthetic hemp. A single length of 6mm, 3-ply spun synthetic hemp has a linear break strength of over 1,000lbs which is about thrice the linear break strength of 6mm, 3-ply natural rope (6mm hemp breaks at about 300lbs). This stuff works fantastically for up lines in suspension rigging.