This method should work with all vendors where VNC is available. It is based on mfsbsd image. mfsbsd is freebsd floppy image what works in ram. Also solution where freebsd is availabe from template install but you want GELI disk encryption. This method uses grub image boot with ubuntu
First install Ubuntu 18.04. Write down network information. GW, Netmask and IP (route -n and ip addr show).
Then prepare grub to boot mfsbsd image.