I would say for the faith he should either combine protestant with the seven or convert to the seven and feel that he should make highgarden into his capital and prussianize ir
maybe have him trained in the way of sword and commanding an army like the original brothers were and I would say don't give him the land that the mc got in original story something new like by the coast but has alot of manpower
why doesn't he worship the war go's directly since we all know that the war God brought them to this world or he worships odin since he's spend enough time to at least accept odin in his heart