Ore sorter improvement: Accept product-specific single product loads

Ever so often I want to accept single product e.g iron loads, but reject the rest like rock, which will go elsewhere. So the suggestion is to get rid of the current reject checkbox, set the default to reject, and introduce checkboxes at each product for accepting. It's doable int the UI. There is room right of the unassign bin.
It is an enhancement to the "Ore Sorter improvement: Accept only if X is contained" idea.