I had also been thinking about adding in a Small Sword (Piercing) to the Light Blades and a Sai (Piercing) to Short Blades.
Note: Short Sword is more of a chopping/slashing weapon while the Small Sword would be more of a stabbing weapon, with some slashing capabilities.
In fact, if you are a Shadow World fan, the Long Kynac is actually a Small Sword, and the Kynac is something of a cross between the Maine Gauche and the Sai. And I would love to be able to gave characters who could have a similar setup weapon-wise.
Here is an image of a matching SmallSword/Dagger (actually, that Dagger could also be classified as a Main Gauche as well) set, that I would think make for a good, and then a pair of Sai
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