I think it might be a bit risky to let ever maker ever do it but it could be an add on that makers have to request to do so and while it would add some admin to people in charge they could check every 2-3 months if people are adding their icons or not and remove access or not. It might seem a bit harsh but I think there might be a way to make something like that work.
I don't really know! I think you might be onto a good thought path!