It sounds like you're looking for a way to make sure the same SSH certificate is on every sever. I can't comment on your specific setup, but usually each host has its own unique certificate. Then you you generate a client certificate on your laptop/desktop/device that you use to log in to any of those servers.
With that said, I have two ideas in mind:
1. You could use 1Password Connect as a central store for the certificates and setup a cronjob on each server that makes an HTTP request to the Connect server for its host certificate. Then you can store the certificates in 1Password and manage them from there.
- You may also be interested in joining our CLI 2.0 Beta and SSH key management Beta: https://docs.google.com/forms/d/e/1FAIpQLSelPzb5hnT7nmTnSZIpKXgi4SLMsOk6zeTwix8HQB34__0h7A/viewform. The SSH key management beta may be the perfect solution for your problem :)