Hmm what are you searching for specifically?
I think no other Qt baded, Wayland-capable DE exists, and thats probably okay.
I see though, how buggy and complex KDE sometimes is. KDE 6.0 will be more streamlined and unified, and I think on that base it cooould make sense to remove components, slim it down more, maybe prefer some resource saving Apps over others, and you are good to go.
At the same time I have no idea what apps should be replaced, as KDEs are very good. And with Trinity, based on some outdated version of KDE, I dont think you will get a good experience.