My "truck rosary" is a twine and wooden bead rosary that my daughter brought me back from Nicaragua - locally made.
When I lose a bead, I just saw through the side of a small wooden bead with a jeweler's saw, slide it onto the twine, and seal the gap with a little rubber cement.
It looks a little bit odd with a few off-size beads here and there, but it's fairly tough.
the cord wooden beaded ones can be very attractive, as well as the knotted twine ones. How attractive are your plastic beads/parachute cord ones? A pic if its convenient would be nice. Right now I’m getting very happy with the knotted twine ones, pretty/attractive, low cost and only need one thing...twine!