I think you can do it if you quantify everything that goes into the number and list that too. For example, if you hire top talent from Google and pay $30k/year more, you could note in the salary table that being from a prestigious company at that level is worth so much, and give a range. It would take work, but if you credit everything that could possibly explain the difference, you might satisfy people or at least explain to some exactly why they make less.

Or, and I prefer this, you could not disclose but pay everyone above market rate so they don't think about money, but not so high that it's an issue/fuels the desire for perpetually more.