It could be done in much the same way as with sportsman where ‘exceptional achievement’ is recognised concept and, while difficult to define, is easy to apply. As long as the whole process takes place transparently it should ensure that it is not abused. The issue is not so much introducing exemptions to the universality of the current system but, rather, ensuring the transparency of the process.  There are already abuses of the system with the children of the powerful, the so called ‘sons of gods’ often finding ways around the law. That is not a difficulty of definition, it’s simple corruption.