I always have the header separated from the disks especially when I'm travelling. You can put the headers on some cloud or web server, even maybe as an "addon" to an image etc. They are small, you can always download them from anywhere when you need 'em. At least this makes travelling way easier, no keys, no headers, no questions. Looks like an empty disk. You can always say: I bought the disk/laptop/whatsoever some days ago, haven't used that part of the disk yet...

But anyway, it's always better to see if there's a way to break the encryption. So, thank you for this real good article, I guess, I will start converting the next days...