For that German, I would requist waiting till Bismark her sister ship is ready as well.
Germany was also working on a carrier, but after the loss of the Bismark, they stopped working on it, the USSR played a bit with it, before using it as a target.
If he can get them together, finished, for a heavy raid...
For Japan, pushing for the third Yamato class to be build as a carrier straight from the start, for one.
Zipang plot.
Greater focus on the submarines, I-21 & I-400 classes being used in greater numbers and on a wider spread of missions.
USA, getting those never builded Lexington Battlecruisers build, so they have some good escort ships for the carriers.
Pushing true the build of the Iowa and Montana classes for the same reason.
If their construction was not halted, they could maybe have prevented the loss of some of the carriers.
Getting a dockship designed and build, recovery and transport of heavily damaged ships becomes then way easier.
Getting the Merlin Engine and pushing true anti-submarine warfare tavtics, including convoy and city night lights, before it was tohave happend.
King is a problem, from 41 to 45, strike iron while it is hot and try to leek the current high admiral around, King was retirement age in 42.
He does not get that if England starts to suggest things to solve a problem, you are already way to late with solving said problem.
Wich if he anti england habit is true, could get him to maybe act before they can even make said suggestions?
O, who am I kidding???