I’ve not seen this particular ending, but I agree that it would be great if companion endings could be resolved before doing anything irreversible such as flying off into the sunset with Lae’zel or (something I have come across) deciding not to live as a mindflayer. I agree it seems unreasonable in either case that there’s so much of a hurry that we can’t help Karlach resolve her ending, though I can see some sort of handling to avoid players making conflicting choices would be needed.
But yes, if that’s all too complicated then the option for Wyll to persuade Karlach to go with him if he’s BoA even if the player character isn’t there would be great, and it does seem the required dialogue is already pretty much there.
