the counters are made. Use them some of your ideas are too strong. For example Chuikov would stay in Moscow making a Soviet last stand impossible for the Axis to overcome.
The counters are perfect as they are and give a little flavor for all AA games. They are universal.
Also, on the note regarding other new units…
If the counter has a battleship i suspect you can also choose a cruiser or destroyer
If the counter has a tank, you can apply the bonus to Mech infantry, or artillery as well.
Thats way nothing needs to be altered to accommodate the new pieces.