I was thinking about the newly split We possible future had Mathilde didn't snap them up, or now more relevant to the next time one of the We decide to split.
Staying in the eight peaks and serving as another guard, assuming there is a gap in the current We hunting ground, is a possibility, but one of the possible future the thread saw is every Karak possibly having their friendly neighborhood spider mind, and in that regard there is one candidate above all others.
Karak Azul, between being depend on K8P, having the majority of their fighting force reside for some time in K8P and thus being exposed to the We. And having a King who both want to drag his Karak out of their imposed isolation and was separated from the Karaz Ankor enough that he would not be a part of any major conservatize force. Also having something to help guard their new connection to the wider world would be a nice contrast with all the gribbles they are familiar with.
Karak Vlag might also be a possibility, through they need a few decades to stop itching for the trigger at the concept of anything unfamiliar, having the We come with the implicit recommendation of Mathilde would also go a long way.
In non dwarves news, Nuln might be desperate enough to be willing to take the chance, and the Amber brotherhood might be interesting in cultivating ties to a possible newly ascending Sapient species.