In my experience, letting the Dead linger in Life isn't a good idea. [For many, many reasons, starting with 'they're likely to turn into monsters'. Sabriel turns to regard the other man, her expression solemn, even if she keeps shifting her gaze back to the spirits- there's so many of them that even when she deliberately dulls her death-sense, she still feels unsettled.]

Besides, how long can they stay in their routine if the town is also full of living people, staying in the same houses?