The POD must be 1870 or later. I guess this means you can make it up to 1932, but I don't think we can get the end goals that way. Most likely we are looking at 1920s PODs. If possible keep it to a single POD.
Here are the things we are conserving: There will be a World War, there will be a Germany, it's OTL post WW1 boarders will apply at some point (such as by losing a World War, or simply selling the Danzig corridor to a new Polish Kingdom, and demanding payment instead of Lorraine you can chose how we get there). UK will be more or less OTL.
"Wait, wouldn't a pre-1900 POD butterfly away WW1?" Well, I can easily imagine a 1890s POD not getting rid of WW1. The assassination of the archduke wouldn't happen with 1911 POD or earlier (it was dumb luck), but I can imagine the Black Hand blowing up buildings anarchist-style (in terms of blowing up not ideology). The terrorists then go back to Serbia after every attempt to catch them. Then Austria makes a similar ultimatum after one too many blown up buildings. There are many ways to get a World War. A POD in 1870 might very well prevent Serbian nationals from being the ignition switch, but we can be creative.
And yes, you can have a post Versailles POD too.
Now, here are the target ideologies. Russia should become communist like OTL Soviet Union. Germany should be vanilla fascist (as in nationalism is high, authoritarian state, high militarism, hate leftists, but without the whole genocide thing) by 1933. Italy can be anywhere from UK level to fascist, but no going to the left. If its fascist, the king should be a figurehead. France needs to undergo a communist revolution by 1933. Poland should be nominally democratic, but within Soviet Sphere of Influence by 1936, just slightly more independent than a puppet. The guy in charge of Soviet Union should be Stalin, or someone not that different in terms of brutality, paranoia, and blood thirstiness.