Love "There Will be Blood" (and PTA), but I don't see how it fits. Plainview as a villain was great because his extraordinary, single-minded ambition motivated him to attempt kill his own humanity. But Plainview failed. His humanity was still in there, in long-abused, long-neglected agony and rage, which had its final, full, disgusting eruption in the final scene of the film with Paul Dano's character. It was evidence that Plainview couldn't kill his own humanity. This made him interesting. My spreadsheet villain succeeds in fully killing his own humanity. I don't know if this is even possible, but given the plasticity and variation in the human mind, it probably is. But I still don't think it would be interesting to watch!
I guess the most searing part of the film, in my memory, is the first / middle thirds of the movie. But maybe I only remember the first two thirds because it's balanced so effectively by the ending. :D
I'd watch your movie, but I agree it'd probably be criticized as boring because the anti-hero doesn't "develop". Maybe it'd be better if you focus on their childhood/adolescence, i.e. the experiences that sparked the intent to crush their own humanity. Godfather 2 vibes.