For the Aircraft carriers I have tried to keep the same timeline, just use different ships to fulfil the events. The following blurb is to lead the Post for Aircraft carriers as its introduction. The only ship in the three (Eagle, Argus, and Hermes) that I have altered is the Eagle in a 1918 configuration in which it does the landing on trials.
"HMS Vindictive (ex-Cavendish - Hawkins class cruiser) was converted while building to the trials ship for the early take off and landing trials of aircraft landing aboard ships at sea. Some of the first trials took place while the ship was still incomplete. Trials were successful to a point. With only the front deck covered with a flying off area, the aircraft had to sideslip around the bridge for landing on. The Vindictive went back into builders hands in November 1917 and emerged in March 1918 with the aft part of the ship now sporting a 230x57 foot landing on area with an enclosed area underneath for aircraft storage (hangar). This area was reached by an elevator that emerged flush with the flying on deck. In this guise more tests and trials were carried out, proving the idea.
While these trials with HMS Vindictive were being carried out, two other ships were under conversion to what was to become the aircraft carrier. HMS Argus was an ex-liner, and HMS Eagle an ex-Chilean battleship (sistership of HMS Canada). Both were to be completed in 1919-1920. However the Eagle was made ready for sea, in an incomplete state, in June of 1918. The Eagle was to carry out through deck trials along with the Vindictive. The trials proved beyond a doubt that the through deck aircraft carrier was the way forward. The Eagle returned to the builders yards for completion in October 1918. Due to various reasons of delays, the ship was not finally completed till 1923."
The idea for using the Eagle as a trials ship while still incomplete came from the photo below. Eagle with steam up and on the move.