I cannot thank you guys enough for this. This took an aging, unsupported QNAP TS-470 Pro from 2014 and helped me turn it into a Proxmox/File Server/Docker powerhouse. The trick was actually getting my hands on the BIOS file since QNAP does everything in their power to avoid giving it to you, so I found one for its bigger brother on a forum (the TS-670 Pro) since it uses pretty much the same mainboard.
Not only was I able to give my QNAP NVME support, but I also used the “UEFI BIOS Updater” to successfully update other UEFI modules on by device. If anyone is doing something similar, I posted my file on the forum Fernando linked above.