Crush Triggers should've been implemented as a buff, that gives guard break property to most, maybe all, moves (character then glows or some effect takes place to indicate he's into guard break mode. Course, can't last forever).
Of course, charging and meter would still be required (say, to perform you just need to hold the normal move).
And depending on which move, if would stagger for a fixed amount of time and deplete guard bar accordingly (would be bad if A moves staggered for a long time).