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This already exists.
It is simply a double weapon sized for a creature one or two size categories smaller than you, in which case the (normally two-handed) weapon is treated as a one-handed or light weapon (respectively), with an attack penalty of -2 and -4 (again, respectively).
It should be noted that a double weapon used in one hand cannot be used as a double weapon; you can choose which end you use from round to round, but you can only attack with one of the two ends in any particular round.