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Surely a single plastic castings can still be converted easily enough for those who want to?
Multipart, like North Star or Perry. Separate arms, and heads. Malifaux plastics are a different animal, they are designed for dynamic poses not modularity. I like them for animals and monsters but prefer the Perry style for humanoids.
Games Workshop do very nice things with monopose, often multipart. They are a pleasure to assemble vs multipose models.
Of course, the one thing that has not been answered is what period/market this potential range of figures is aimed at.