As I understand it (please correct me if I am wrong), the OP can go the K-2 "follow to join" route, but the K-2 DS-160 would have to be submitted within a year of the K-1 visa being issued....After a year, the OP would have to go the consular processing route with an I-130.
(Disclaimer: The K-2 would have to meet the other requirements as a K-2)