What if we could spend up to 3 points in each specialisation, each giving us access to the next minor trait and to the next major trait choice? Kind of like it was with the old trait system, but there would be 3 points to spend instead of 30, and we wouldn't be able to pick a adept trait in a grandmaster slot.
If we only need a trait that is in the first tier of a specialisation, we could keep the others 2 points for another specialisation. This can even be applied to elite specialisations (while keeping the "only one elite spec at a time" rule, of course). New build possibilities, more flexible classes, more customization to fit your very own playstyle.