If you are using GPG keys and have the master key backed up somewhere you can fairly easily use that on an offline machine to add the new key to the full batch of password files without needing to perform a million button presses.
Could also disable the touch to decrypt feature while you performed the rekey?
Disabling touch is another option if you need to do a large batch of operations and are comfortable that your machine is secure.
I'd highly recommend using the `fix` option instead of `on` to make sure it can't be disabled.