After wasting some more of my precious green yarn, I have succeeded in starting my second round on a green starting chain with reasonably even stitches. The chain is kind of twisty-looking, but I think I can straighten it out. This is fortunate for me, since I have yet to find the tapestry needle I could swear I've seen no more than six months ago.
Here's a more interesting nalbinding tidbit about nalbinding. This costume blogger suggests that nalbinding may have come about as a way to use up loom waste--odd bits of thread cut from a loom during the cloth weaving process. Her suggestion may not be provable, but in terms of carefully using every bit of handspun thread possible it makes a certain amount of sense. I intend to think about it some more.