Well, effort for such undertaking has started by yours truly as a Caddy module/plugin. Here's my announcement blog post: https://www.caffeinatedwonders.com/2022/03/28/new-ssh-server....

It's not abandoned. I'm still trying to move the project forward. I've just been busy with life. I've moved the repo to an org and put a new name on it: https://github.com/kadeessh/kadeessh. Contributions and help are more than welcome. I'd love to evolve the project, but I need hands and feedback from users, which I haven't received much of.