Yes, Robert agrees as well that it is likely a South African. He was only familiar with this as a form of D. spatulata as mentioned, but after some discussion I think we are all in agreement that it is a South African.
It seems very much related to dielsiana, at least superficially. I note the slightly dark bases on some of the flower photos offered that I have come to associate with D. dielsiana and "nearly D. dielsiana". I am looking forward to seeing the seed and growing this little mystery of many names.
I should point out that Robert corrected me as to the open (relfexed) sepals in D. spatulata, saying this feature is not always well developed even on adjacent buds. He is right, but usually idf you look closely you will find a few pods with this feature on the scape, and when you do, D. spatulata should come to mind.
Pond Boy, D. spatulata sometimes forks as well, but this particular forking seems consistent. One bud lower down the scape, and the rest on another fork higher up. If your plant is indeed D. spatulata, it is not the plant in these photos.