I would prefer composers when speaking of a „Stockhausen school“ because the term points to techniques in composition derivated from Stockhausen’s techniques. I just remember that York Höller used the term „Klanggestalt“ for a compositional nucleus which is used quite similarly to what Stockhausen called „formula“.
I feel that it could be useful to have a discussion-forum on the music of Stockhausen. There are so many people from all over the world, young and old, learned and eager to get into contact with this musical world: musicologists, composers, musicians, music lovers; people who plan concerts - who write books or have to give lectures and so on. So there should be much stuff, many ideas that we can share. And when we have open questions, there may be people who studied just that and could give a hint or a stimulus.
A problem might be the English language, but i feel that is the only possibility that many people who are interested can participate. And we can exercise tolerance to mistakes!