Installing FreeBSD-15 directly on an SSD, or "wait this 2007 era AMD K8 1RU server doesn't boot from USB flash?"

I .. ok let's not talk about why I'm putting freebsd-15 on an old K8 era box. (it's for network hijinx testing with old realtek PCI cards, don't ask.) Anyway it's an award BIOS from 2007 that has the following USB options: USB FDD USB ZIP USB CD-ROM .. and doesn't like whatever FreeBSD is doing to the USB flash drives these days. Anyway, that meant I needed to figure out how to bootstrap FreeBSD…