Who cares what Astrum wants? They can deal with it.
It does raise a good question, if Astrum/Morek won't allow it...can be done by force? I don't see any reason they wouldn't want to diversify the north, but those two realms might throttle the whole plan if they are inclined to. Plans need to spread in game for this to happen, so knowing if they are cool with the idea will help realize those plans (even if they aren't cool with a Night's Watch realm up there).
