To be honest, I think that all those are great ideas.
I love specially the related with Kristoff return. I like his character and has been sadly seen how he has been ignored or even negated. Actually ignoring/negating his existence was one of the reasons that made me reject the Infamous Ironman storyline.
Personally I think that any history trying to humanize Doom has to include the two living persons who actually loves him, Boris and Kristoff, they are his family the fatherly figure and the adopted son.
I don't understand why nobody has shown interest in using Kristoff, a youngling with the intellect of Doom, many of his memories (making him perhaps the person who know him better) and knowledge of magic.
Since the history about how he deals with a set of memories that aren't his, how he gets his magical powers and how he develops, from a poor orphan gypsy boy to a Doom son's I think that boy has a lot of potential. Seeing him as an "Scorpion" kind of character would be fun and coherent since he has shown more interest in physical combat than his father, ability for magic, and taste for theatricals. Sadly he has been ignoring since before Secret wars.