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I doubt e.g. OpenSSH would ever implement something like you describe though. They're seemingly very much against anything x509/WebPKI.

You imply OpenSSH is the place to do this work.

Given the protocol changes needed, it may be a new implementation. I actually expect it would be.

I believe section 7 of RFC 9000 would allow for the creation of a handshake protocol which could conform to SSH without the need for including x509.

Thanks for the tip, wasn't aware of this.