Another thought I had is this. If you think the tip end off the blade would profit from additional protection from, say, rocks or logs, try this. Make a small batch of epoxy, and thicken it with wood flour. Get it to the consistency of thick peanut butter.
Then lay a 1/8" bead along the edge of the tip. It should be an extension of the existing blade shape, making the blade 1/8" longer. To help provide a first general shape, you could sandwich it in waxed paper, and shape it with your fingers. Don't try to streamline it now, just get it fully across the blade and straight.
After it is fully cured and rock hard, shape it with sandpaper. This will provide a tough, replaceable tip along the bottom end. When it wears or breaks in rough use age, repair it like you built it.