Moving from RSA to Ed25519

[Dominik George]

Hi,

I was thinking about moving from rsa4096 to ed25519.

I really do not want to lose all the signatures on my key.

What I could do is add the ed25519 signature and encryption keys to my 
existing rsa key as subkeys, but I guess this will not improve security 
because my RSA signature key could still be used.

From my understanding it is not possible to expire the primary key and keep 
subkeys.

Did I get something wrong? If not, what is the smoothest thing to do to 
migrate?

Cheers,
Nik

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