Thinking About my Feet

I've been thinking a bit lately about the bottom of my legs. By this I mean the legs of everything I design. At the moment it's just plywood, which extends to the floor. I have tried buying soft feet and adding them, I have tried hard nylon feet, I have tried just leaving it wood. Here's the problem with having no feet. When you move plywood furniture enough on a hard surface eventually the plies start to split apart a little bit due to all the friction and it will eventually compromise the piece. I don't want it to happen to my work. So they need something. Now I could externalize this task on my customers and have them identify that need and go buy something. That's ok, that's sort of what I'm doing, but I can do better.

What's my dream solution? Some sort of sustainable hard material which I can machine into the right shape and use. The problem is I am not having an easy time finding anything. The obvious choice is UHMW or Nylon. This hard material is easy to machine, durable, and doesn't mark floors. I don't want to use plastic in my work. I don't agree with supporting a material which doesn't ever degrade. Another option is using 100% recycled nylon. I'm not sure about this. Does using a recycled material help draw demand in some small way for the non-recycled variant?

At the moment I'm considering using at least hard maple. Since I'll be using small amounts it shouldn't consume too much of this valuable hard wood, and it is durable enough to withstand lots of friction. It isn't non-marking though meaning customers may still need to add a small soft felt button under the foot. Still it's better than what I have. On the other side of the coin, it's possible that my customers may never notice this small feature if I do choose to splice in hardwood feet, and I'll do this work for little gain.
I make everything to a specification which makes me happy. I know I'll be pleased with this small improvement. Now I just need to figure out the route which makes the most sense.