Would the four-carrier counterfactual prevent the RAF from becoming independent?
Short answerNo; the RAF already existed, but a stronger Fleet Air Arm would probably gain independence earlier.
NotesThe RAF had already been created on 1 April 1918, before the treaty-conversion scenario. Extra carriers in the 1920s would therefore affect the Fleet Air Arm's position within an existing aviation organization. A larger naval air arm is expected to gain independence earlier.