it may be possible.
i think you'll have to add some sort of "effect" to the shockwave-based ability.
Take flamestrike for example, it burns enemy for damage, but each unit that got damage inflicted on it has a little fire SFX attached to it, along with the buff of "flamestrike" etc etc. Go to the flamestrike spell, inspect it's "buffs/effects" that it uses, and find out which one makes units have a flame on them. Then, just copy this effect to make a new one, name it "strike effect" or whatever, give it the model you want, put it in the same respective spot on your strike-shokwave ability as the flamestrike had it, and voila! you have your spell...I think that should jsut about do it, i haven't actually tried myself, but it'd make sense. gl