You assume that the British Empire is perfectly stable and united to face an ascendant Germany, when Ireland is going up in flames and India is beginning to simmer with nationalism. So long as Solf and Willy stay reasonable and time it right, then Britain can do nothing but watch as Germany rises to power...it's already been decided that without cassus belli Law cannot just go to King George V and ask him to declare war.
Frankly i take the social, economic and psycological consequence for the Empire of a low level civil war in a little island and somekind of nationalism, than 5 years of the most brutal and devastanting war know to men till that monent, not counting the conflict that started immediately after and UK partecipated like:
- Irish war of independence...and the following civil war
- Turkish war of independence.
- The Third Anglo-Afghan war (the Turkish-German mission had some serious consequences towards the start of conflict)
Colonially (and i include Canada, Australia, Nz and South Africa) speaking, without the stress and need of the war and her consequences things will be more quiet and regarding India, well if there isn't no Hindu-German Conspiracy is a little victory over the stability of Empire for sometime more; if there is...well casus belli for London.
Honestly, if we must make a constest regarding stability a neutral British Empire vastly beat and outclass a German one that had just wage a very costly war (both in human and material term) and need to face the social, economical and political (internal and external) consequences.
Novemberprogram...reasonable!Willy and Solf will probably just use it as a guide, and adjust accordingly. Peace has to be concluded with Russia before France is defeated, that way any attempt by the British to mediate can be countered by Germany asking France to accept terms as well...which the French militarists will never do, allowing Germany to carry on: an independent Poland with one of Willy's son as King (though he'd have to take a Polish name and learn to speak and write Polish), independent Duchies in the Baltics with Dukes chosen from German nobles already living there, all with German-style constitutional monarchies. Finland will again have one of Willy's sons as King, though he will also have to learn to speak/write Finnish and take a Finnish name, and the Finns can choose between British and German-style constitutional monarchies. Let Ukraine become a republic...all of them receive economic 'kick-starters' from Germany, tying them to Germany and setting the stage in the long-term for Germany's recovery from the war, and setting up a German block in Europe/buffer against Russia - MITTELEUROPA.
Now this little German dream need to face that nasty thing called reality.
German and Poland relationships...well it will be very complicated and his very probable (basically a must) that they will soon rebels as the project of Mitteleuropa is to create a little Warsaw pact/Comecon analog to serve the need of Germany, and strange as many can think, not all the population agree with this.
Regarding the internal german situation i have already talked above and frankly the A-H situation can easily escalate in a series of civil wars that can destabilizate the Balkans for years.
Stall Austria-Hungary and Romania, then knock out the French without invading Belgium. Easier said than done, but they almost succeeded in OTL, and that was with them running on fumes...
They can sure, but this mean an high cost as the French are now on the defensive and more loss mean more instability post-war creating in this manner a very Phyrric victory
Assassinate Franz Josef or stall until he dies a natural death, and then the empire will disintegrate...Germany will annex Austria, and back Romania and Hungary to divide between them the other Austro-Hungarian territories in Central Europe.
Or devolve in horrible infight and wars that need lot and lot of Germans troops to keep checked and that make Iraq and Afganistan look like some nice vacation spot.
Greece...the British will probably sign a treaty with them to check German influence in the Balkans...the Germans should let them, that way Germany has no need/obligation to back Bulgaria and Turkey in a war against Greece. Otherwise Germany can just support the 'division' of Serbia and Montenegro by Bulgaria and their other allies.
why would there be socialist revolts in Germany and their satellites? The socialist revolt in Germany in OTL was sparked by the effects of a British blockade and the bleak situation of the war...victory would strengthen the monarchy's grip on power, though Solf and Willy will probably compromise with the republicans over reform: the Chancellor is responsible to both the Emperor and to Parliament, and the Emperor's 'reserve powers' are reduced in letter but not in spirit.
The resolution of the situation between socialist and old guard will happen, victory or not...and will not be pretty