I'm very interested in this combination also, and will probably try it out this weekend. I have a fair bit of experience with snorted k, but usually in combination with either LSD, MDMA or Nitrous Oxide. I expect that the combination with DMT will potentiate the DMT, as Ketamine tends to put one in a state of detachement that is very similar to what is often achieved with prolonged meditation - something which seems to enable further travel in the DMT realm. I also expect that this detachement will have some protective effect, as someone mentioned, but as with relaxants, this protection may not be ideal. Just as living life is preferable to seeing yourself live it while on k, travelling the Realm may be preferable to seeing yourself travel it. That being said, I bet it is a great tool to reduce some of the overwhelming feeling and to experiment with new navigation techniques.