> When I did this, I had to pre-include the ssh keys, so I haven't fully mastered the process, but it was good enough for the task at hand.

Apparently there’s some “cloud-init” package that might handle that? I’m still not entirely sure what that package does and how it works though.

When I needed some AMI images, I used the official Debian Stretch image and converted to Devuan, making sure all all of the Devuan packages like devuan-keyring and devuan-baseconf were installed.

—Tom