I started playing on kong and didn't bother to switch early on. Big mistake. I am now unable to obtain the DLC, and I would rather play on steam anyway. From what I can tell, there is NO way to convert a kong account to steam. I can't imagine this would be too much to ask of you people, regardless of how small the community of kong players is.
And no I don't expect this to be read. Mostly venting here. But if you have a method to do so, please tell me!
At the moment, steam players are the only players who are catered to. Kong players and players like myself who run the client off my PC by itself have no way to get the DLC.
Nick has said that it "Will be looked in to but I'm not sure if it's possible", which means that it probably won't happen or is low on the priority list. Most of the raging has cleared from General Discussion now, so it's likely to never happen.
~Sev