Ok, understood. The part I'm confused about is the focus on NVMe devices - do you also have a bunch of SATA/SAS SSDs, or even conventional disks for your media? If not, I'd definitely start there. Maybe something like six spinners in RAIDZ2, this would allow you to lose up to two drives without any data loss.
If NVMe is your only option, I'd try to find a couple used 1.92TB enterprise class drives on ebay, and go ahead and mirror those without worrying about the different performance characteristics (the pool will perform as fast as the slowest device, that's all) - but 1.92TB isn't much for a media server.
In general, I'd say consumer class SSDs aren't worth the time it'll take you to install them. I'd happily deploy almost any enterprise class SSD with 50% beat out of it over almost any brand new consumer class drive. The difference is stark - enterprise drives offer superior performance through PLP-improved latency and better sustained writes (thanks to higher quality NAND and over-provisioning), while also delivering much better longevity.