In our relations with the HE, why have we not just offered them the crown? They want the crown, and good relations with the dwarfs so they can get back the phoenix crown. If they help the Dwarves, the Dwarves will not give the Phoenix crown back UNLESS they actually have the Nemesis Crown. The only way they can bargain with the Dwarves, is NOT to help them.
If we find it, we give it to them because they are so powerful and all knowing. All we ask is they ally with us, and non-aggression the dwarfs. No case of we will keep it, or we will try and safe-keep it. We will out-right give it to them. Desperate times...
Furthermore, what about the Chaos Dwarves?
Someone had the genius idea of giving away the mountains, why not offer it to the Chaos Dwarves? There are all kinds of races coming to the empire, all kinds of races that can be made slaves, especially their hated 'good' cousins. Whats more, while the Dwarves will be focused on the Empire, the Chaos Dwarves can attack the rear of the Dwarves, to take their ancestral holds. Plus, if we bring them in on it enough in the fluff, they may even get a new book
The DE idea is a good one, but most likely won't work. The best I think we can offer them is asking them to attack the O&G in the Empire, and take them as slaves. I'm sure Orcs would be good slaves, stronger than humans and more resistant to the whip (the DE like that stuff). We can make mentions of them cutting off our retreating enemies and slaving them - and we let it happen because they aren't attacking us... Major wins for the DE getting HEAPS of slaves, and lower losses because we are non-aggression for them.
I still think the VC idea needs a bit more exploring... This special character I think is probably a major player without us knowing, however if we can suggest to the Vampire Counts that the Dwarves are the ones who are threatening their lands to look for some 'crown' we can get them attack them. They are close to the mountains after all.
Seriously though, the Dwarves are being immature in their alliances, we might as well play a little dirty. I am so sick of reading in official fluff "the Empire is still recovering from 'x' war". When are we gonna prosper damn it!
The main problem I see in this was the thought that actually went into the campaign. They chose the 3 most recent races to get out some new miniatures, rather than actually think about what races can ally, and what races won't, and what ones are neutral. They probably would have made more money releasing miniatures not from the recent ranges as well, as that way people might buy the army for the new miniatures, rather than the recent release. Ah well....