Great news for everyone. I was approached by a developer who has been working on an NVMe driver for OS X. The one Apple sent out only works for their drives and has multiple checks and double checks to make SURE it won't work with 3rd party drives.
I have been testing the 3rd party driver and can confirm that it functions on my Samsung 512GB drive in a PCIE adapter in a TB enclosure. Function in a cMP is being fine tuned, I was able to test it there as well.
More info soon.