The beta release for Plasma 5.26 will be today. Several new components will be included, one of those is Plasma Big Screen (plus supporting components like Plasma Remotecontroller, Aura Browser & Plank Player).
Do you see a need/use to add this big-screen support to KaOS?
One new component that certainly will be added is kpipewire, so no need to ask about that one (should be up later today in the kde-next repository).