Ouch, I had forgotten about those specific devices. I had a Mac Mini Core Duo that I had upgraded to a Core2 Duo and was never able to get Snow Leopard to boot into 64-bit mode. I was able to get Linux and even OpenBSD installed on it using the previously mentioned bootia32.efi method.
Also, you may be able to boot 64-bit macOS on your system if you follow the netkas.org link from your everymac.com link: