The only way I see to keep the defense against planes manifesto is to provide
the 1 AA roll per cruiser.
Cruiser
Attack 3
Defend 2
Move 2
Shore bombard 3
Special 1 defensive AA first shot @1 against up to 1 plane/per cruiser unit.
Cost 10
In such situation as above,
if Cruiser A3 D2 is added into the mix, 2 units (A6 D4) for example:
Attack 13 Defense 14, 5 units.
A. survives: 22.1% D. survives: 75.6% No one survives: 2.3%
That way, Cruiser is clearly not better than Destroyer against incoming Submarines.
But you still get a better Anti-Aircrafts platform while keeping his single offensive roll of Shore bombardment.
This can be balance with a 17-18 IPCs 2 hits Battleship.





