I would question the use of Iroko for anything that would be in an intimate enough contact with foodstuff to warrant consideration as food safe.
A lot of individuals are allergic to the Iroko.
I've used spirit stains to disguise sapwood in darker woods like Walnut and Zebrano that have been finished with sanding sealer and wax for Fruit Bowls with no problems and used spirit stains to tint sanding sealer and finishing oils.