I wouldn't bother with all that. Just get an SSD to install your OS and applications on. Standard SATA SSD or even a newer PCI M.2 drive.
As I said before, maybe even just get nothing for now, deal with what you have, wait until some of these PCI M.2 drives using the Phison E12 controller start showing up and get one of those. They have the advantage of having 960 EVO M.2 type sequential performance combined with MOSTLY better than Optane drive random performance. At least going off the initial results of that controller and configuration.
I was hell bent for getting a Samsung 960 EVO or Pro PCI M.2 drive until I saw the review of that Phison E12 and then instantly decided to wait because the random and not queue depth limited...