Bane of the trapped can be used to trigger numbing traps ya? That being the only thing to trigger a freeze or whatever. No blade armor being used in this build.
If you are close enough, the secondary effect will indeed proc Numbing Traps.
The aura on it is quite small though. Its only 12 yards I believe.
If you are relying on the secondary effect then yes but the diameter is very small. Everything that receives the debuff will be in punching distance of you.