If you have access to the bootloadet, you can still set systems.unit=emergency.target, or init=/bin/bash, or rd.break=pre-pivot, or boot into a live-cd environm

If you have access to the bootloadet, you can still set systems.unit=emergency.target, or init=/bin/bash, or rd.break=pre-pivot, or boot into a live-cd environment. All of the normal emergency options work. For less fatal emergencies, I don't see anything that would tie this instance of sshd to tge network.