It's a shame that you are not sharing the secret, cause Blizzard are currently working on fixing this, and your secret will become worthless very soon. Sharing is caring.
Well I don't care, but I will still share.
Yes there is a "bugged" server out there that seems to not check. Once you make one there you can make them anywhere as you have the lvl 55 requirement off it.
I don't want to say the server outright to slightly help any web crawler bots that might find the info, but think where wow launched most recently and that will cut down the list of servers to try greatly. Note this was with a US client as I don't play on any EU realms.
Why don't you try every one of them and see?
Even if you could do it, f2p DK's wouldn't be viable in the 59 bracket. It would only be useful for running yourself through dungeons, which you'd still need someone to group you for. Or killing Burtusk if you get the "watering the bushes" quest bug.
And that's only if you could even leave the starting area.
Your time to try a DK in WoW! Blizzard is probably going to fix this a lot sooner than class balance because we all know how much they hate fun.
Can't believe i'm agreeing with you
see you in the 50-59 bracket tonight ;-)