I like the idea, although I don't think nudges have speed bonuses of any sorts.
So I think the damage would be too high to just do that much every time it hits. It would have to be something low. Although, I believe the damage aspect of it would be part of the nudge itself, not the shield.
I am not saying it is impossible, but it is a lot harder then it may seem.
In my opinion, if this were to come out the shield will have to have a slow speed rating as well and lower damage. Maybe like 5-10 pierce damage
Nice idea though.