I don't think you need to go that far. Unless you qant variety, just go for the empire! Sack the moot over and over again as you get free skeletons researched. With a few powerleveled heroes and lords you'll can go pure skeletons. The characters can be your damage dealers, with maybe a corpse cart and a monstrous unit or two. Overcast Wind of Death and nehek are so absurdly good that they can just carry a campaign. All skeletons need to do is blob up and hold while you funnel magic into spells getting 300-500 kills a cast.

Plus, vampires under isabella and your lords are wrecking balls in melee. Takes them a while to do it but they can chop through hundreds of troops without much trouble. Ghoul kings are great leveled up too, but finding building space for them is tough.

Once you get rolling your biggest issue is that the empire takes forever to finish off. Greenskins can usually take the dwarves to a standstill if you just obliterate the Empire. After that finish off the dwarves and you can finish the campaign out pretty much however you want.