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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