Is there a way to import existing SSH keys to Seahorse?
Export and Import Keys
Seahorse can import SSH keys from the clipboard or a key file. Seahorse allows users to specify a SSH key file. Seahorse does not change the content of imported files, instead, Seahorse copies the imported files to ~/.ssh with non-duplicated file names.
Seahorse can export public key or private key info to new files. Seahorse can copy public key info to the clipboard.