Like someone said above... if you have your SK pet targeted, it will count as undead and you can nuke it with your undead only nukes. So that will work fine for evocation.
A good place to go to do this btw is Shadowhaven. As you cannot cast detrimental spells in the bazaar, PoK, or other "safe" zones. Shadowhaven has no KoS mobs (unless you screwed up your faction), so you can cast all day long and not worry about AFK aggro, etc.