I don't enjoy playing evil either.
Currently, there is a mod that does exactly that - Minthara gets knocked out/poofs out of the fight when she gets to 0 health, the story progresses as usual on a good playthrough, then you meet her again
But mods are unavailable for consoles, and she doesn't have a camp spot of her own.
The party agrees to travel with a
dude with a nuke in his chest, a vampire spawn, a gith, a follower of Shar who is a dark goddess just as Lolth is... no one bats an eye when Mizora starts camping with you, and only some companions get upset if you sleep with her.
I am sure her and Halsin could come to an understanding in order to bring down the bad guys, as he is old enough to understand that war can breed unlikely alliances.