I thought the the limit was 5 feet for the trap supply, and i think in this case it would be well within that range. Tub and shower traps are almost always below the floor. The AAV would be installed after the P trap. I do believe however that the green drawings would be the easiest and best solution.
Jack the limit in most codes is 30". A shower or tub trap is below the floor but it is well within the 30" limit. Also the AAV must be after the trap.