Magneto joining hands with Charles to build a society where his ideologies coexist with Charles's IS an evolution for him. The acceptance that his path may not be the only right way.
And really, his "machinations" just involve the marginalized and oppressed taking back power from their perpetrators in a non-violent way so that the latter can no longer hurt the former. The only people he explicitly mentioned cutting out from power structures were the hateful bigots who needed to be neutered, influence wise, for the welfare and betterment of his people. That's a FAR more sophisticated and nuanced approach than just "the only difference is he isn't violent now".