Well, there's always the old okinawan Eku, which is the oar they use in kobudo. I'm still not sure whether a paddle that's optimized as a weapon is sufficiently good for paddling. Weight would be one thing, because a heavy paddles more miserable to use than a light one, but it makes a better weapon.
I also recall that someone (perhaps in India?) had a standing paddle that was sharpened on the other end, although I think it was used mostly for fishing.
Perhaps someone's better informed on this than I am.
Best,
F
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