There is some merit in this, but first I'm going to focus on your problematic proofs.
I'm going to quote all of the relevant Words of Radiance excerpts:
The biggest problem I see, and this is an inconsistency problem, is that assuming the book goes in at least somewhat chronological order, we have these events:
Melishi the Bondsmith was going to destroy the Voidbringers the next day. That night, he presented something different. We have no idea what it was or how long it took, but this new strategy was hurried so presumably not very long.
There are then 8 chapters, of which the Radiants are definitely still active, before the Recreance.
Chapter 32 implies that they were at peace at the time, and 38 at war. So there was a start and stop to the fighting. Incidentally, it's very possible that chapter 32 was referring to corruption by Sja-anat and perhaps she wanted to defect even then...
The Recreance began when the "wicked thing of evidence was discovered," of which we think was revealed in Oathbringer, that the humans were originally the invaders because they destroyed the last world, and that Honor was ranting that they would destroy this one with Surgebinding.
"They," probably the Windrunners and Stonewards, "reacted immediately," but probably not by betraying their oaths, as that would come later.
The KR performed an "act of great villainy" which was also beyond previous impudence. It's likely this is abandoning the Shards at Feverstone Keep and probably elsewhere. We also know that there was fighting at the time with the "parsh."
"two thousand made assault upon them, destroying much of the membership" This phrase implies that the KR were most or all gathered in one place after abandoning their Oaths and Shards, and that an army attacked them. It's unknown if these were singers or human, but probably human.
The last order entertained subterfuge, somehow, which led to harm to the other nine. (As I can't imagine them the Skybreakers being subtle, I still wonder if it was a different order to refuse and the Skybreakers were refounded later.)
This doesn't quite line up with what you propose. So if the Melishi is #1 ended the voidbringers, how was there still fighting? Radiants would destroy singers without access to voidlight of forms of power, and there wouldn't be any fighting at all if he stripped them of Identity. Maybe he did it on a small scale? It's entirely unclear.
It's very possible that the wicked thing of evidence is destruction of Narak instead of finding out about the past. But the listeners/Parshendi is not evidence of that, as they were unaffected by whatever changed the rest of the singers because they were already in dullform. They chose to separate from their gods deliberately, not by what the Radiants did or did not do.