While I really like this cocktail I don't go through the honey-ginger syrup fast enough before it goes bad. I've experimented using the original recipe, using liquid ginger juice to make the syrup instead of roots, the one above with ginger liqueur and honey syrup, and using ginger liqueur and barenjager (replaces the honey syrup). Sadly the one I like best is the original, which requires scrubbing, peeling and slicing ginger root.
Try freezing syrups so they keep longer, and see if you like it