I've just added it to the question ... thanks. To be honest, I don't think there is anything that's robust, non-tech friendly, easy to set-up, and reasonably s

I've just added it to the question ... thanks. To be honest, I don't think there is anything that's robust, non-tech friendly, easy to set-up, and reasonably secure. It doesn't need to be secure against state-level actors, just against people accidentally copying in someone unintentionally.