Thanks @kenkendk for the info on how to create an url-encoded SSH private key. How could one do the same thing offline (e.g. using linux setup) so that the private key does not need to be sent to an untrusted website? Kindly, Fred
NOTE: Perhaps Base64 and URL Encoding and Decoding can be used using the 'url encode’ option, when adding the ‘sshkey://’ prefix before adding it as an ‘ssh-key’. This page can be made available offline and still functions. Did not get this to work yet though.