Even if Luria and Fissoa united I doubt we could field a force that would be able to take them on offensively. We might JUST manage a defense, but then the realm has almost 100% movement of there 41 nobles from all reports. I somehow doubt we would have the same.
Now if Luria and the Moot allied, and the two coalitions worked together, maybe. But could you imagine the co-ordination nightmare?
I'd rather use Aurvandil to bash on the Zuma, personally. Aurvandil scares me more than the Zuma does, and annoys me far, far less. And they both have shady ways of gaining their might.