I have only just gotten around to reading this, and I must say I am extremely interested by what you have done here, mostly because you had the same idea/concept as myself in using the Dark Master to fill this role and tie off some of the inconsistancies between editions. My intention was/is to go one stage furthur and use him to be the God that the Fimir worship, as there background does not fit currently and in the Warhammer Forge books they are noted as being Chaos followers so it made sense to link them to the Dark Master..
My concept was that the fimir were 'his race' for want of a better term, and when he was cursed and imprisioned by the other chaos gods, this is when they also turned there backs on the fimir forcing them to live in the way they currently do, I also like the idea that the Fimir were cursed by the other Gods at this time, which is why Fimir have almost no females and those that exist are barren. My idea was to include the Dark Emersaries as a daemon specific to him, as well as linking daemons previously linked to the Fimir as other lesser/petty Daemons for his patheaon.
The main reason why I wished to head down this path was so that I would not/could not be repeating the work done by others in this regard, and also at the same time, being a likely/possible route GW could take if they were to write up the background for them in a current edition. I realise this all may come as herasy to those traditionalists out there, but I wanted a concept to bring the Fimir back but in a way in which they could seemlessly fit into the current world concept.
So to see someone else is thinking along the same lines as myself, makes me think that my idea/concepts are not as likely to be rejected by the community for breaking away from the orginal background. I am still very much in the process of writing up my take on the Fimir, but I wondered if you would object if I included parts of your write ups about the God, as I see no purpose in me writing up alot of information that is already out. Obviously I would give you credit for what has been done, and if you wished I could send you a draft before I present it to the larger community so that you where happy with what I had attached your name to…
Anyways Great Stuff. Thanks Crimsonsun