I agree that the Hots should have both Mictlan & Lanka. If you want to dilute them a little then increase the game to 4 v 4.
I think that Helheim, Niefel & Caelum is a very strong team. Not necessarilly tougher than Mictlan & Lanka plus one other but probably stronger than if the hots have just one of those bless/blood powers. Blood takes a while to get going and all those three Colds have very good expansion even without the double+ blessing of Mictlan & Lanka.
Ulm is a viable option for the forging for Niefel. But I wouldn't give up Helheim for them as Helheim are far more interesting to play and can blood sacrifice, and a blood inspired dom push by the hots is a danger.
I would like to play. But I don't want to be stuck with Abysia no matter how thematic they are
I am very happy to play Mictlan or Lanka, but only if the other is playing as well. I don't want to be the single great blessed blood hope of the hot team
I would be very happy to play any of the Cold powers.
But I am also happy not to play, in which case I can set up the map placements for you if tell me which map you are going to use.