I tried looking for Gameshark codes that would allow for the game to be unlocked immediately, but I couldn't find anything. I doubt that it would have helped you anyway, since you are playing on the virtual console.
The suggestion about finding a ROM hack is a really good idea, but again, I don't think it would work with the Wii U. I might try it out on my Everdrive this weekend and if I find something, I'll let you know.
Just out of curiosity, are you doing this because the DK64 arcade game is supposed to be the closest to arcade perfect? Obviously there are many other ways to play the original DK arcade, but I don't believe many, if any, are exactly the same as the original arcade.