A more roundabout and simpler way of adding chords/added notes

So…i’ve noticed there isn’t really an easy way to do stuff like say, E5 with just an added b13 or b11, because they do exist, but the only way to do that would be to add the 7 on it, so chords like, i dunno, C#sus2 that has a flat 9 on it makes it almost impossible, or it is possible, it’s just a needlessly complicated way to do it when it could have been more simple because while not being very common, they still do exist and are still played. Thanks, and keep up the good work!