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Regarding Ples's idea:
If we're talking about a base in Chimerae, I'm strongly against it. The attitude towards vampires there is very negative.
If it's in another part of Sarceid, then it's a 50/50 situation. It still seems dangerous, being in a vampire lair. Although, I understand Ples's motivation.
On the other hand, perhaps we can come up with another motivation for the character. Vampires, from what I've read, are quite adaptable. Especially the first generation, which, in theory, has no limitations. Subsequent generations probably require loyalty to Sarceid, but that's it, because it's unlikely that this rather successful kingdom would try to create any more non-vampire units and so on; what would be the point?
In short, ambition is a plus. Serving Sarceid doesn't seem to be a necessity.