It seems strange to bother trying this with sit-down toilets first. This could cheaply be applied to the urinals at a facility of sufficient size, e.g. a baseb

It seems strange to bother trying this with sit-down toilets first. This could cheaply be applied to the urinals at a facility of sufficient size, e.g. a baseball stadium. You could install a collection system by the end of the month. If the material is worth collecting then the stadium owner will have an extra revenue stream. If not, the cost of retrofitting millions of homes and public sit-down toilets certainly won't be worth it.