Well, I guess someone will have to do the more unconventional proposals, in addition to the conventional ones already discussed;
- Vampire Counts - Some hidden Vampire was worried he was going to be found, so he got a bunch of others from Sylvania to try and invade. Basicly the undead are just kinda there.
A vampire cornered in our lands. He could either struggle to make it out alive (kind of), or... we could enlist him. Not the most Sigmarite thing to do, but the only reason he's becoming hostile towards us is because he feels threathened. If we convince him that he's not on our black list, he might turn towards other, more immediate threats. Maybe even the threats we propose to him.
In the end, we could always turn on him and finish him off. After all, he'll be a lot easier to find when he's our ally
.
(Somehow I just KNOW there's something in the fluff about VC which hasn't come to my attention yet. Something that will completely ruin this plan. But heck.)
- Dark Elves - They don't have the strength to attack for the crown directly, but they are upping their raids on the coasts for slaves etc.
So they're not going after the crown. That basically gets them off our back, except for the fact that they'll be attacking our undefended coast cities. So how about a proposal; we pay them so that they do not attack us, but the northern coasts instead. Get them to fight chaos instead of us.
All of this should happen in secrecy, of course. We don't want the "council of light" to find out we're allying with the bad guys. Still I think that these races could prove to be useful allies, especially since they're "there to be there". This adds a whole new dimension of fluff for them.