Like other commentators have already mentioned but the openssl suite already solves these problems and even more complex ones

For example:

Specifying different keys different servers

Host github.com

    User git

    IdentityFile ~/.ssh/id_rsa_github

Host myserver

    User username

    IdentityFile ~/.ssh/id_rsa_myserver

Reuse SSH connections for multiple sessions

https://blog.scottlowe.org/2015/12/11/using-ssh-multiplexing...

https://blog.poespas.me/posts/2024/04/27-optimizing-ssh-conn...

Host *

    ControlMaster auto

    ControlPath ~/.ssh/sockets/%r@%h-%p

    ControlPersist 600

Other than that, you can also do ssh agent forwarding, port forwarding etc. These are all crucial functions that user like me need when we access remote machines.

I hope you take this as constructive criticism and not a knockdown on your work. You've created and released something that's great but this site usually brings more advanced users.