I am a custom maker, and a collector, of non-metallic blades (they fall in with the rest of my exotic, but practical, weapons, saps, blackjacks, etc)... so I have a CAT Tanto.
There are several better Zytel pieces out there. Forget slashing, and just stab with Zytel.
G-10 or Carbin Fiber (especially the latter) are the materials I preffer for a non-met.
Yes, grind the edge and point off, and make sure its nicely de-horned, and you'll have a great trainer... just tag it with some orange paint to mark it so (mistakes can happen).