Associateship would be automatic, so that hostile schools or whoever else would not be able to deny it to anyone. The most prestigious universities would be contacted in order to make the Associateship an admission requirement. And this charity would be called after a Labour politician who fought to defend the grammar schools as the ladder of working-class advancement. There are plenty to choose from: Ellen Wilkinson, George Tomlinson, Sidney Webb, R H Tawney, Eric Hammond, to name but a few.
That would be a start, anyway.