This sounds incredibly interesting to me. I am all about flexibility in games as it keeps you interested in them. That is what I am attempting with my Global variant map and house rules with it. Except I am only doing WWII as it is what I have available, and due to limited funds and limited experience I am not willing to undertake something like this on my own… yet. But this sounds incredibly interesting. If there is anything I can do to help out let me know. Assuming this goes beyond an idea
Very interesting customizations for either Great war or WW2 games..
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https://www.seawarstore.com/NavalEnsignsDlx.htm
This site offers dedicated military flags that are placed on the table for each player.