I picked up a spool of bamboo thread from a craft supply, once, with the same idea. Problem is, bamboo thread is not twisted-up from long fibers. They crush bamboo, then chemically ret-out the fibers --which by that point, are just short torn-up lengths. Then they spin that into thread, called "Viscose". What you end up with is no different from soft cotton thread, made of short fibers. If you pull a length between your hands, it breaks immediately.
-John