@SS:
This the easiest way.
Tac C11
A7 .69 D5 .50
Dive C11
A7 .69 D5 .50
Fig C11
A6 .60 D7 .69
N. fig C11
A6 .60 D6 .60
But you are loosing the distinctive trade-off 10 IPCs is basic 4 move, 11 IPCs is 5 move.
(And a sweet 10 IPCs spot in cost structure.)
It blurs the difference between land or naval and makes Carriers weaker due to +2 IPCs cost increase.
Naval fighting on land will not be less impactful than land only planes.
But historically speaking, not having to be limited by shorter landing and take-off airfield allows for greater capacity.
Between two units with similar function and different cost, I rather keep the same strength but increase combat values (DD, Cruiser, BB balancing), so purchasing option are clean. You get the same per IPCs invested. More IPCs don’t mean stronger, just different combat values so to keep balance.
Otherwise victory oriented people will chose stronger units in most cases.
Like MIs over Tank in G40, because MIs def is stronger, for IPCs invested.
DDs over Cruiser and BBs.
Fgs over TcBs, in G40.
Most of time, it is the cheaper which is stronger, but this extend to even cost of course.