Oh, I see now, where you are going with this. I would not want to be Gorbachev in your timeline variant.

I still do not see Germany becoming reunified without the signature of the USSR, though. I think the Western Allies would have tried to convince the USSR with all the money and promises they could muster, but if the USSR said no, that would have been it.
Hmm ... perhaps... Not
entirely sure I agree, though: at this point the SED will have lost its control of the country, and the USSR's grip on the SED would be slipping. With mounting suspicion in the West towards the USSR due to them moving army divisions back and forth in Eastern Europe to sit on people asking for basic democratic liberties, I am not entirely convinced the Western victors, nor the BRD, would have felt the USSR's signature on the paper all that imperative for going through with Die Wende — and the DDR population would only have been too eager to agree. The remnants of the SED might have had objections on principle, but I'm not sure all that many would have been interested in listening to them at that point.
And anyway, at this point, the Brezhnev Doctrine was defunct, kind of making the point moot anyway. It's only in response to these events that it's revived.
But let's see ... how about this then — this might actually fill in a couple of blanks I had ... you'll not pity Gorbachev any less though, I fear:
"Gorbachev manages to beg, borrow, and steal the mandate required to get the USSR's signature on the treaty, but the backlash from the hardliners is forceful. The signature is immediately denounced by leading Party representatives as an overt act of treason. It now once for all being proven that Gorbachev will not stop at undermining, even corrupting the Revolution to further his misguided agendas, the hardliners set in motion agendas of their own that force Gorbachev to find himself more and more sidelined and marginalised. The names that helped Gorbachev get the treaty signed are one by one put on trial and imprisoned on a variety of trumped-up charges, until August 1991, when Gorbachev himself is put on trial and sentenced to five years in house arrest. In a comfortable dacha by the Black Sea, but forevermore out of the political scene. The USSR never formally ratifies the treaty, and once Gorbachev is out of office, the new leadership instead denounces it as an illegal act of annexation that the West managed to force through only by subverting corrupt individuals in the Soviet State."
Mmmhh ... I dunno. I may prefer my original one, actually.
Anywhoo...
PS: I could see this work. But I am still not convinced it is a better story that FL's alpha version is in its core, i. e. 1991 and all that. I struggle with FL's premise for the UK, but I find the narrative for continental Europe believable enough not to change it at its core.
My main problem with Ligan's Alpha version —
apart from that its first point of deviation from the historical timeline is the August Coup [
details], and that its narrative has more revolutions in it than I'm really comfortable with — is the "All-Powerful Bear" scenario: you have a bankrupt, teetering Soviet Union that has lost the
whole Warsaw Pact, and is economically on its knees ... but nonetheless in six years manages to rebuild a war machine that not only by far surpasses its old self, but also surpasses the entire former Warsaw Pact ... to a point that enables it to invade much of the Continent — annihilating
all NATO forces in Poland —
and all of Sweden,
and the UK ... while
still having forces to spare to present a credible threat in other theatres.
(As a point of reference — they build all of this in
six years, whereas the average military hardware programme takes
eight years from definition to implementation.)
Oh, they also manage to do all of this with
oil income ... during a decade of low and declining oils prices ... somehow unhampered by any international embargoes or boycotts...
Plus the CVBG in the Baltic (let's not even go into the CVN anchored in Stockholm...!). And the roles navies and airforces play (or
don't play) in the scenario. And various other bits and bobs ... I've expounded upon this quite extensively in various threads, I suspect. In summation, the current version just doesn't cut any mustard in my book.
So, that's the reason why I'm jotting down these ideas... I feel it
should be possible to create something that can give a more plausible starting point to a war on the scale that the game's setting requires.
But I'm not quite done yet...