That is extremely similar to one of my ideas. Except mine, in their era, mostly use flintlocks these days, and their faces have evolved into beaks.
I love the way you changed the sword to work with their anatomy. I've developed two types for mine: one is very much like yours except that it doesn't sweep back so much so it can be swung out to point fully forward using only a wrist motion. The other came out over the back of the hand, a bit like a Wolverine claw.
It is stupidly difficult to design tools and weapons for creatures whose arms don't even bend like ours.
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