If Odium were lured to Scadrial, would his physical body turn into a burnable metal? If so, could Harmony create an Odium-metal legion of Mistings to consume and burn it? Would that weaken him sufficiently enough to be killed or destroyed?
The difficulty here is, again, one of Identity. People born on Scadrial have an Identity tied to it and its magic. Odium would have to do certain things to make them able to use a magic he fuels. He has done these things on Roshar, so it’s not impossible for him to manage it on Scadrial.
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