Not many smiters run 86% fbr (1 frame) but 2 frame yes very common as you have it with any level holy shield. Not sure where your smiters has 50% evade from, but I suppose it's viable with knarst.
This also has its weaknesses for offensive capability, where the assassin has versatility, a strong shadow and as every assassin should use... Stunlock.
Like i said, it's a neat idea, and I would love to test it.
Oh, and barbs ww at 4fpa.