If its not too much work, maybe make an alternate Kaiserreich scenario?
1923 Europe:
Central Powers:
Germany owns Poland, the Baltic States, Belarus, Ukraine, Wallonia and some of the French border regions (as well as Alsace-Lorraine ofc)
Austria only controls Slovenia, Venetia, South Tyrol, Bohemia and Moravia
Bulgaria owns both Greek and Serb Macedonia as well as Romanian Dobruja
Ottomans control Anatolia, Syria, Palestine, Lebanon, Sinai
Entente:
Great Britain controls the British Isles, Malta, Gibraltar, Cyprus and Egypt and has an established beachhead in Brittany
Belgium controls Flanders and Picardie
Italy controls all of Italy and Libya except for Venetia and South Tyrol
Portugal owns Galicia as well
Government Forces of France own Southern France, Algeria, Tunisia and most of Morocco
Serbia owns Northern Serbia, Vojvodina, Albania and Montenegro
Greece owns all of Greece except for Macedonia
Romania owns all of Romania except for Dobruja, but they own Besserabia
Syndicalist Forces:
Spain doesn't have Galicia, but has the Rif
Communist Forces of France own the rest of France that hasn't been taken
Hungary owns Hungary, Croatia and Slovakia
Sweden owns Norway
Russia is neutral since so much of their territory is taken by Germany.
It is a LOT to ask for, but this is just an interesting idea and not meant to be forced upon you guys.
BTW, you might want to have it so that players can only play as the Entente or Syndicalists so as to make this a very challenging scenario.