Okay! I definitely agree on that part: Psychics would still be the persecuted ones, and it likely would not he humans vs. everyone else.

However, I'd also limit the number of MECs in the Roleplay (and in the in-game world) to a small handful. The process involves amputating all appendages and connecting you to a large armored suit, and as this takes place merely five years after the end of the war (and the discovery of that tech) I would say that the only "true MECs" are former XCOM-operatives, and the process of less extreme augments on the civilian population is still in a rather rudimentary stage.