Bringing Lexington under treaty tonnage during construction

How could the United States redesign Lexington during construction so that it did not have to understate treaty tonnage?

Remove the Y turret, shorten the protected citadel, and use the saved weight to concentrate protection elsewhere.

Removing Lexington's Y turret during construction is the preferred correction. Eliminating that turret saves the mount, barbette, magazine, and ammunition weight. It also allows the armoured portion of the hull to become shorter and more concentrated. Some of the saved tonnage could then strengthen other parts of the design while bringing the ship closer to an honest treaty declaration.