I bought a worksharp for my current school and my first school. A bit like a motorised “scary sharp” system. Faster than a tormek, it’s so simple I teach the kids how to use it so they can sharpen their own chisels. Once you have all the blades at the right angle it’s very fast. New blades take maybe ten minutes to get cleaned up and to the right angle. When you do the initial shaping/sharpening it does go through a fair bit of abrasive paper and the replacements aren’t cheap, but I’m going to experiment with buying plain paper and using spray adhesive.