You will not find any Nvme like this on the market
EDIT: why would Sony bothered making a patent for it or even customize it, if it's not to cut the cost , making it more accessible or make it even faster.
If sony using normal Nvme for PS5 they will not make any patent, or making any statement.
Why? Well to have a proprietary device which only Sony sells instead of using off-the-shelf SSD - at premium prices, of course.
The Nintendo eShop rating Thread: http://gamrconnect.vgchartz.com/thread.php?id=237454
The Steam/GOG key gifting thread: https://gamrconnect.vgchartz.com/thread/242024/the-steamgog-key-gifting-thread/1/