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So...
Much like the forgotten Snare Drum's drumsticks, it isn't True Dual Wielding and merely appears as such. It's considered a two handed weapon and no, you can't put a third sword for a triple wielding.
I should probably mention I don't own this either, so I can't confirm is shields are wearable. I'm sure someone can.
Shields are not wearable, this also counts for ineffective shields. Not even the cooking table can be equipped alongside it, oddly enough.
It does however count as a dual-wield weapon for the purposes of Final Hit.
Did you try wielding the shield as a giant?