Those plants in your list that are not bulbs like Aristea and Nivenia will resent the eventual lifting and replanting of true bulbs in your bed if mixed with them. Most important is to group only those bulbs that could be told from one another in the dormant state. For instance, if you grow Triteleias, Bloomeria and Dichelostemma together it will be impossible to separate them except when in flower, the worst possible time for disturbing a growing plant.