I haven't done this, but I might, lol. If you don't mind stealing from 3.5e material (which is most of us) then here is a way to incorporate Mind Flayers, Githyanki, and Gythzari. 9000 years ago, when the Divinity encountered the Dominion of the Black, the Dominion had captured some crew members. They find out where Androffa is, & send Mind Flayers to subjugate them. Later, maybe 7500-8000 years, Androffa manages to revolt, lead by the charismatic leader, Gyth. Now divided into the Gythyanki & Gythzari, each race fights eachother, but both are searching for the Divinity. Maybe they feel the ship's AI is responsible, maybe they don't know the full story. Whatever it is, now you have 3 new parties that can play a hand in Iron Gods.