Ok guys, so I am going to propose you a challenge; well, actually it is a pretty hard one, and I understand that most of you will judge it to be totally ASB; anyway I do not need it to be realistic...just not totallly implausible.
So here you go: we are somewhere not long after the end of WW2...say 1950, or so; I need
a) A unified Germany
b) Germany too retain all of Silesia and Pommerania; OstPreußen may be well screwed, instead...who cares
c) This is veeery difficult: Germany to keep Austria and...Bohemia...yes Bohemia, please don't laugh!
d) And here comes the other very tough one...Germany to be ruled by an Habsburg with Wien as its capital.
Now, the rules:
a) I can accept anly POD from 1944 onward, except one wich brings a war between the allies and USSR after WW2...I mea, the war in Europe ends in May 1945, and that's all, as in OTL.
b) Germany is deafeated as it is in OTL (not totally mandatory...I can accept a settled peace if you deem it necessary, but nazis have to, of course).
c) I am using this for a novel I am writing, so it may well be semi-realistic to some extent...I mean you can insert non-historical characters if you wish so...just not too high-profile characters.
d) As for Bohemia, I can accpet any kind of semi-independence, autonomy, and so on.
And now some suggestions:
a) Points A and B should be easy to accomplish: just have Hitler to be killed in 1944 and operation Walküre to succeed. Now let's say that ther provisional government opens negotiations with the allies, and that it comes to nothing. We may have the forces on the west front to simply withdraw, relocate to face the soviets, and block them for alittle time upon the Vistula. In that case we would have the western allies arrive in Berlin, Wien, Prague and Silesia. Now, given that West-USSR relationship was already a diffcult one, right after the war, it is palusible that all of this may well screw Yalta, and make up for a united German state. As Silesia and Pommerania had been german for almost 1000 years I see no reason why the allies would accept to give theese lands to Poland (wich has, in the mean time, become a communist country...actually the whole Oder-Neiße thing all came out from Stalin's wish to carve Germany as much as possible).
Also such a POD would put Germany in a much better position diplomatically speaking: germans may play the "we were the first victims of nazism" card, à la Talleyrand; they may even say that they "freed themselves all alone" and so on. USSR would be furious, but substantially impotent, and the most they scream, the most western allies would consider building a strong Germany to counter them (with conditions of course)
So the first two points, while remaining not very likely, are not at all impossible, in my opinion. Point c i s a close call, actually, but I think that while veeery unlikely, it is not totally impossible as well, at least for Austria. Pointd i very difficult but far from impossible if you accomplish point c, wich is, in my opinion the real tough one.
Good luck!