Not sure if this fits right in with the discussion, yet I came across this item while looking for the same thing. I ordered it to test and hope it will do the job.
https://www.newegg.com/Product/Product.aspx?Item=9SIA6V87KE3807
According to the description, it is what I'm looking for:
Compatible List (NVMe only):Samsung SM951- NVMe, PM951-NVMe, 950 Pro NVMe SSD, SM961, PM961, 960 EVO, 960 Pro, 970 EVO, 970 Pro.INTEL 600P.Liteon T10.And other PCIE M.2 NVMe SSD.