Bulk Edit Subscription Default

Right now you can bulk edit subscriptions by adding a new one to a collection of contacts. 

I imported a list a while back that I have since then lost the file to, so I can't re import them. But they all have a subscription added to them as they were imported incorrectly. I would like to be able to bulk edit their subscription and change it from Opted into a newsletter (currently) to opted out of that newsletter and neither opted in or opted out of any subscriptions (aka default). I don't see that option anywhere. I only have the option to bulk edit opt in. Other than that, I can go through the list each individual at a time and take them off the subscription, but that seems like a long way around. 

An option to bulk edit the subscription settings would be much appreciated.