well along the ideas of the blades i'm thinking that if the weapon is crafted from metal rather than glass you could have a blade delivery system say like a sheath where the blades are actually stacked on on top of the other sort of the way a samurai sword is crafted from many layers of ultra thin folded metal but rather each blade is unconnected from the next allowing it to slide off into the target poisoning them.
and with the blade of last stand i see a problem obviously this falls under a weapon of a suicidal cult member or such considering the blast effect. moreover i would rework this into a type of weapon sort of like a vibe spear or so where it gets stuck into a opponent so you have 1d5 rounds to get away before it explodes or explode on contact as its thrown like a volonx thunderclap.
personally i would craft a couple different weapons where its more of a ranged attack or hit and run. perhaps a bola with the three weight eing frag or krak grenades depending on your scenario where you could throw and snare them onto the ground when they explode 1d5 rounds later or more of a grenade knife where its a hollow serrated knife that can be thrown 3m or stabbed to be left to explode with a chosen grenade effect 1d5 rounds later and also removing the blade would require a strength or medicae test to remove the blade a failed test dealing 1d5 wounds armor not counting and a failure by three or more degrees would cause the weapon to explode.
So those Mule kicks can hurt