Advice on best practises for journals?

I’ve had an email from someone who will soon be editing a postgraduate (or, in American, graduate) journal.  They are hoping to practise triple-anonymous review in order to reduce opportunities for bias, despite being very short-staffed and they’d welcome practical advice on how to do this.  They are also hoping to encourage submissions from members of groups currently under-represented in philosophy, and looking for advice on how to do this.  Any thoughts?