You could get the KE back with a hardox disc quite easily. You get say 12mm thick 650 cut to form the main disc, spokes, and teeth, with a bolt pattern around the rim, and then ~5mm steel of any kind, and put a circle of it around the outside on either side, bolted on. The result is a strong, cheapish disc with massive KE and a plenty tough enough tooth. I will likely experiment with that sort of thing, maybe for next year.