Perhaps it was the reference to the ribbon that helped. Sometimes it
makes sense to try things before one rules them out. In any case I
found a home brew solution that seemed to work OK, using ribbon style
dental floss.
I held a 12 gauge guitar string in my left hand, holding it with thumb
and finger just past the twisted wire. I put the dental floss dispenser
in the palm of my right hand. Using thumb and finger on the right hand
I was able to wrap the dental floss over the guitar twisted end with
little effort. I think it only took a minute or two. The guitar string
did flex a little while wrapping but not enough to be problematic.
I suppose this needs to be tried and installed in a guitar to be sure.
I suppose the wrap could become loose or even wear out.
Danielle