I've been able to get the DK into the chieftans hut by selecting him as the first character, stopping my conversation with the chieftan, and then entering the hut when it goes back to the DK outside. I've saved my game inside the hut. However, this does not appear to have done me any good because as soon as I go outside and meet a tiber, one hit from the tiber kills me... It doesn't matter if the hit is my DK or main character...