Install and boot Windows 10 on NVME drive with legacy BIOS

My BIOS doesn't support booting to an NVME drive. Despite this, I succeeded in installing Windows 10 on my NVME drive. I also have a secondary non-NVME drive in my computer, and apparently the Windows 10 setup put some kind of (bootup?) partition on that drive.

My tentative plan was to install Windows on the NVME drive and then find some workaround to boot to it.

Upon boot, I was taken to a blue screen with this error code: 0xc000000e

What is the smoothest, easiest way to boot to Windows on this NVME drive? Should I install Grub on the secondary drive?