Maybe back it up with a lightweight synthetic line to catch you in case of failure. Something like Mercury is pretty light.
I think it would be interesting to see a historic(we'll say early 19th century) field to finish rope. You cut the hemp(how exactly; machete? Some kind of old steam machine?). Get the fibers(dried then threshed(probably incorrect term; beaten), threshed then dried, something different?). Spin them into threads(how?). Turn those threads into small cord(same as the big rope above?), and then rope.