There are quite a few humans who will work with the undead.
Inquistor, (maybe priest), Paladins, Possibly archmage, and the Rune Mage as well.
They do not incur a morale penalty in doing so. You could use the paladin as a starter tank to take the first counter attack, then use the black knights to follow up, but I find this is hard to do without double-cast.
You can also use another army in the meantime (keep the black knights in reserve) until you do get to a sizable team of undead.
The biggest problem is the annoyance of using either resurrect and/or eviln.
You'd really rather use only one or the other. Not to mention, I find eviln sort of crappy since you can't eviln to revive AND fight in the same round, unlike resurrect.
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