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I would suggest looking at spear tips from a few models. One or two may have "prongs" that you could reshape a bit to suit... then cut the shaft off of the spear.
As to an off the shelf Sai? You're looking for a specific needle in a giant pile of needles.
Not that it's a reasonable cost, but the spear tip from this fellow...
Dark Eldar or Dark Elves have parts that might work? I'm thinking DE Corsairs have little knives that are maybe the right sort of shape, but much thicker.