Linux EC2 Instance with Single User Mode and BIOS Password

I am working on hardening an Ubuntu instance for a customer, they are asking that I use a Single User Mode and BIOS password. The problem that I am running into is that keyboard input is not available at the stages where it would be on a physical machine. If I set the BIOS password, the machine will not boot because there is no way to input the BIOS password. If I set a password for Single User Mode, I will have similar issues. Is there any known way to do this?