lichmaster
Hero
Right, I was quickly looking for some feats that could allow for something similar but I didn't find any. Thanks for pointing it out.By using the NIghtstalker feat on page 389. Second bullet point says "You may deal Sneak Attack damage when making attacks using unarmed strikes or adept weapons." Since the adept focus feature "Adept Weaponry" says the chosen weapons count as adept weapons for you they would qualify for sneak attack under the feat.
Given the feats and class combo you need to pull it off, and given the fact that a vanilla 5th level rogue with no feats would do the same damage with a shortsword sneak attack (1d6+3d6 vs 2d6+2d6), I'm not concerned at all by this.