Weird. For me, I can just open 10 clients and log in on all of them with no problem. If it still doesn't work I am sure a middle man would be happy to transfer it for you.
I would be happy to do it for free, but I understand if you want to use someone with more vouches
I'm pretty sure theres no problem with multi-logging now. If you do have a problem just sign in both accounts at the exact same time. You shouldn't have a problem there.