Is this a sure thing? Wouldn't the dyschronometry of the elves, the documentation of the research, and the fact that waystones are typically proximity based lead to them not wanting the testing site to be near them at all?Maybe an Ice Witch will have no problem spending months or years away from Kislev, maybe not. Regarding 'the part we care about', remember that our two main partners most definitely care where the magic goes: the Eonir and the Karaz Ankor both use the collected magic to power something. If they join the project they will probably demand we work on their part of the network specifically, since that's the part they care about, and we already have two different networks (at the very least) to worry about. I do think the Ice Witchs knowledge will prove useful, I just don't think we have to recruit them at this moment. But we can wait until the end of the adventure and see what their attitudes are.
I do think Kislev is too far from base, but it's either replicable or not, and most everyone thinks probably not. Why would they want to prioritize their section of the network for the project?
P.S I typed analtemporal at first but thought that doesn't look english, looked it up and apparently it's dyschronometria.