It is impossible, I have finished the game yesterday and my thoughts went into the same direction.
Baldur's Gate III is an obscenely good game, but the ending left me with quite bad aftertaste in my mouth. I am an old-type RPG guy and I am more than willing to run the extra mile to get the best possible outcome. Nobody get's left behind, no stone is left unturned and no spoilers in the internet are being read.
Long story short what happend to my good-aligned cleric in the game was the following (Heavy spoilers related to Divinity 2, Mass Effect series and of course BG3 inbound):
- Unwillingly betrayed the Emperor (why even bother with lengthy quest to get Orphic Hammer? The sole reason for me in next run would be just to mess up with Mr. Devils Advocate).
- After not using the illithid powers even a single time in the game, I ended up as babyface Mind Flayer (I expected similar mechanics like in Divinity 2, where if you do not use Source, you get angelic wings at the end and can pass through last dungeon. Small but awesome acknowledgement).
- After scouring every nook and cranny, helping Gondians, Ironhands, Hope in the House of Hope and dozens of other powerful individuals I just stood and watched as my most likeable party member, Karlach, just agonizingly goes up in flames. That is a real bummer. The ending for her is wrong on so many levels that I will not even start that here.
In old BG2 I've worked hard to turn even worst villains in my party to the goodness and did everything possible to get a good, even if a bit bittersweet ending. Even Sarevok and Viconia ended up as "good guys" in my party. In Mass Effect series, I played consistenly through the whole series to get a Shepard that not only saves everyone but also survives the fabled three-colors-ending in a quite positive way. I expected the same kind of depth in Baldurs Gate III.
After my run yesterday I am left with lasting feeling, that my choices through the game were superficial and all the choices I've made through the game are being just scrapped off and redefined by one dilemma close to the end, same as in original Mass Effect 3.
