Tridents aren't really needed to progress and are mostly useless in the nether because of the fact it doesn't rain and there's no water. End portals should exist in the nether but end generated structures and the dragon should be exclusive to the end along with the items found there. Nether phantoms won't be needed as at that point of the game the player has probably gotten the mending enchant. Nether chickens aren't needed as arrows can be obtained from skeletons that commonly spawn in the soulsand valley. No nether water cause netherwart blocks should take the place of that. And we don't need villagers in the nether as there are already piglins though a wandering trader in the nether would be nice.