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So, Hasbro or anyone has yet to try a retcon of Unicron's origin in G1, even considering the new retcon about thim being a multiversal god.

Here's my two bits.

Unicron and Primus fought each other, that's a given. This was a multiversal battle, taking place simultaniously in every universe they existed. This is of course the marvel comics version. When he was destroyed in the comics, he went into some kind of out-of-the-loop limbo

So, although Unicron is in some kind of limbo, he still has his god powers, eh? So he twists around fate for Primacron to make him a body, because he needs a conduet in order to exist in a universe.

Anyone who doesn't exactly exist in a universe needs a way to get in.
Because not all universes have the same timeframe, he could have been destroyed in G1verse, then found his way into Otherverse. This process repeats through the Unicron trilogy.

Knowledge (at least Unicron appearing in each universe's religion) could be attributed to Primus giving them the knowledge.

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Okay, not to the G1 cartoon retcon of where the Cybertronians came from.

yes, the Quintessons created the first Transformers (excluding the first 13). Primus saw it as a good way to be lazy and just infued them with sparks, and programmed them slowly with higher intelligence. He also slowly taught them the art of Transforming, to ensure none of them even knew he existed.

Sadly, I can't explain away Computron right now. Give me time and perhaps I could.

This isn't as fleshed out as I would've liked, but it's a start for a retcon that hasbro doesn't want to touch. I'll fix and clean it up later, but what'd you guys think?