The crimpers can work, Dutch uses them on dutch buckles, zip ties sound like a lot more work, more weight and high chance of failure on a 1/16 shock cord … not sure they would even get small enough to hold … this might be overthinking it in this application…. if you're worried about failure, then simply tie a single stopper knot on both ends of the shock cord before knotting each end together to form a loop … totally unnecessary though given the application …. I can pull as hard as I can on these knots and am unable to undo knots or break the shock cord … I would keep it simple on this one, personally.