Re alternating A, B w/os:
Just as you outlined.
Same progression overall, just fewer steps. So you could use larger weight increments between workouts. ie. instead of a 5lb increase between two 'A' workouts, you could add 10lb. If you did rear delts (where you will not be using a lot of weight) for 'B' w/os, a 5lb increase each time would probably be plenty. For some of the big lifts like deads and squats you might want to increase by more than 10lb.
Obviously, for any exercises that are in both A & B w/os, calculate increments as per 'vanilla' HST.