Love the project! And love the concentration of different solutions.
I've used the 49 strand flexible wire for stones, because of the sharpness & abrasion issues. I ran the wire through a crimp, through gimp, through the clasp, back through the crimp, then crimped & covered the crimp with a crimp cover. This was to avoid the scratchy & raw-looking wire guards, and I thought the crimp cover looked more finished than a flattened tornado. It looks almost just like a solid metal bead, if you're careful. Available in 14K.
Cheers,