After the war the allies were amazed at the German trenchs
Concrete floors, and firing stands, Tunnels going back and down, hundreds of feet to large bunk rooms with kitchens and showers.
If the war continued for another 2 years, these would start approching a early "German Marigot Line"
I see Rasputin's senerio as likely here.
Germany loses it's oversea Colonies, [German east africa lasts a little longer than OTL as Germany sumgles supplies in to them]
However Germany makes east Europe into it's playground . [Intervenes in the Russian Civil War???]
Italy and the Ottomans both drop out after signing seperate peace treaties.
India gains it's independence, as Britian struggles to pay for taking over it's new African Colonies.
Japan takes North Salhaikin island, during the civil War. But without the US prodding stays out of Siberia.
US stays Isolationist, except for Caribean/Central America. [US Foriegn Policy 101 -- When in Doubt, Send the Marines]