OSB and Kimon's Chosen (Grim Dawn)

And the question is, will I be able to change the faction when I move to a new level of difficulty? Passing on the veteran I chose the chosen ones, but after going through their chain and seeing their "deity", to put it mildly, I was disappointed in them, now I want to see what the order has to offer. And here is just the dilemma, to finish the game to the end and start on a new difficulty or create a new character, that would be for sure.