I just canceled my order for the Samsung T5 external SSD because I want to see if this is a viable option. It's late, past 5 AM here and I'm dealing with a bad case of insomnia, so maybe I'm not thinking straight. A Thunderbolt 3 PCIe NVME SSD Enclosure (Cube) on Amazon is $200. Instead of this, I am thinking an eGPU enclosure like the Sonnet (also $200), with a M.2 PCIe Adapter ($22 - many others out there for cheaper), with a NVMe internal SSD plugged into it should work. Ignoring the benefits of aesthetics and size of the SSD enclosure, the benefit of the eGPU enclosure is that it can also be used as an... eGPU enclosure. And there are even M.2 PCIe adapters like this that take 2 SSDs (M.2 NVMe M Key & M.2 SATA B Key). There is also an enclosure like the Akitio Node Duo that has 2 PCIe slots inside, though I haven't looked into it much. Am I missing something obvious here?