ps. perhaps this might work?
https://mod.io/g/baldursgate3/m/darker-shadowlandsThere is a similar mod for the Gauntlet of Shar in Act II and Grymforge in Act I - they make the environmental lighting very dark. Basically obscuring everything in shadow, which might be easier than blur or using camera focus stuff, since in addition to the trees there's also similar texture on the buildings and the climbable ladders and whatnot. This mod seems to knock most of that out by just making it black.
I have a feeling that it might require you to go torchless or without the Moon Lantern, but at least that might still be scary in a way you find appealing, rather than hard pass.
I don't know if there is a mod to skip ahead by game Act, but that might be another solution. I'm sure they have one for the Prologue by now, but something that allows the player to advance directly to Act III might be nice. I'm not sure how it works with all the flags for the companions though, like if it's even possible to do that in a way that doesn't break a bunch of questlines or whatever, but also I think a time machine to Act II or Act III, might be interesting for players who have done the first third of the game to death, like in EA. It could also be interesting if they lowballed the XP, so for example trying to deal in Act III slightly underlevelled as a way to increase the challenge, though that's a pretty roundabout way to resolve your dilemma.
I'd maybe try the lighting mod though, so if it does the trick for you, or at least might make it easier to just blast past that part like a run through the dark