> I have heard that gnupg for aes256 uses cbc mode is this correct

No.  GnuPG uses a version of CFB mode.  CBC mode is not part of the spec.

> would like to know the command line to send a key by RSA 2056 or higher.

If your recipient's primary encryption subkey is RSA-2056 or higher,
congratulations, you're done.

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