Not sure why you think you need to give up the Emp hat in your precast set just because you're looking to nuke in a different hat. You can have both.
That said, I don't see a purpose for that hat if you have access to other options. I certainly wouldn't use it as a SCH. Most of the BLM Emp pieces are pretty mediocre on their own, and I don't think an infrequent proc of the set bonus is enough to stay competitive with 4/5 Nares. If Nares is not an option, I don't think I would break the Emp set for Rubeus.
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