So hello, I'm back.
I tried surfeasy, and it DID work! Unfortunately it's a paid service and the trial only lasted less than a day.
Other VPN's don't seem to work, and now I feel like I've been had. Played the first mission in Co-op, had fun, and now I can't do that anymore. What a tease.
I hope there will be a better way of doing this in the future.