You have some of the most interesting ideas on this forum.
I would only have the two boards fighting each other change and the part where the boards don’t wrap around, but not the Panama Canal or national objective rules-just a fe questions and recommendations:
So I assume that West India is given back to UK Europe, and Western Canada is given back to UK Pacific-is that right? Thank you!
Is there a capital for the Soviet Far Eastern territories?
You might need to make a new map, as the proportions on the map do not allow for your idea to work effectively, unless they are already explained before playing, but that might be tough, especially with the sea zones.
For national objectives, change all references for the respective powers from Allies or Axis to the respective map alliance (of course, this means Japan get all their national objectives, but it also means that Italy and Germany get most of their national objectives as well).
Finally, all Soviet national objectives should be given to the Europe side (how the Soviets will get their Berlin national objective is if they liberate it, there is still the first time rule), and all Pacific related national objectives should go to the US Pacific, and all Europe related national objectives should go to Europe US. This assumes that all national objectives are for the global version. The 10 IPCs for the US control Eastern, Central, and Western United States is split evenly between US Europe and Pacifc