Hi David. What about cutting clear acrylic rods to 1/4 or 1/2 inches length and using a construction adhesive (liquid nails, gorilla glue, etc.) to attach them to the stones? You can find some on Amazon in different diameters: https://www.amazon.com/Plastic-Rods-Acrylic-Plastics/s?keywords=Plastic+Rods&rh=n%3A11260349011%2Cp_n_feature_seven_browse-bin%3A3071216011&c=ts&ts_id=11260349011

I have Jake Hobson's "Niwaki". I think I bought it on Amazon a few years ago. The photos are lovely, and the drawings and instructions are very helpful. It doesn't have any of our western native species, but you might be able to apply what you have learned on your pinyons.