gpg -k and gpg -K both show my main key. I compiled a copy of gpg1 (not
installed to the system) to try to use locally, since it doesn't enforce
the use of a passphrase for the secret key. Unfortunately, without
secring.gpg, it doesn't see the secret key at all.
I haven't tried this, but it might be exactly what you want to do:
/path/to/gpg2 --export-secret-keys 0xMY_KEY_ID > secret.gpg
/path/to/gpg1 --import secret.gpg
When you import the secret key, secring.gpg will be recreated, and the
corresponding public key will be automatically imported into
pubring.gpg. (A copy of the public key is embedded into each secret key.)
At that point you'll have the necessary pubring.gpg/secring.gpg files,
and should be able to change the passphrase at a GPG1 command line.
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