That's a really good idea, Devin. It would probably save less than a gram to put the eyelet right at the top, but it would pack more conveniently.
I've had some PMs about making these for people, but I think I might not really have time for it. My workmanship is imperfect, anyway. I encourage anyone who is interested to just order some rod and experiment.
Art, I did find that straight stakes are easier to use in very rocky ground. They can be hammered in between the rocks, whereas the corkscrew has to be screwed in. It works well in hard ground, but I had it jam when I tried it in a rock crevice.
I'm interested in seeing how 1/16" rod might work, Tim. That's a good idea.