OPEN SOURCE THE MAGIC CHALK RECIPE AND MACHINE PLANS
The article gives the impression there was a specific highly custom production system where the materials were selected for the machines and the machines were fit for the materials. And the machines were apparently jury rigged adaptations which probably lack detailed blueprints. Sounds a bit hard to formalize, after the fact, without quite a laborious effort.
While it wouldn't be perfect, such a machine could be standardized or improved, and quality could be iterated on by people who care about it until they could make their own chalk that was better than what they can easily buy.
Heck, just the recipe might be sufficient for people to do that.