If you're going the Law God route Solkan obviously wouldn't forgive anyone of Chaos, ever, for any reason.
Alluminas and Arianka, maybe, but Arianka would probably demand attonement in battle and Alluminas would give you an LSD trip vision and a spirit quest of such incoherency that you'd turn into Xavier: Renegade Angel anyway.
Come to think of it, and going off of this post, I don't think many gods are known for forgiveness. Not in life, anyway.
Sigmar, Morr, Taal, maybe would forgive a Chaos follower, but of course they'd have to prove themselves.
Shallya I think would be the only one willing to have any mercy.
Ranald would call you a pussy either way.
Manann would text you passive-aggressively.
The Elven Gods, at least the Heavenly ones, wouldn't, especially Asuryan, since he's on Solkan's level of pure Chaos hatred.
Lady of the Lake would call you a traitor.
Dwarfgods would put you in their own books.
Necoho would call you a loser for following a god in the first place, Zuvassin would call you a loser because he can, Malal would call you a pussy unless you go out like a man, and Hashut is Chaos enough that he'd prrobably think of you as a traitor.
Assuming literally ANY of those gods actually care about you enough to notice in the first place.