I too am very interested in 480nm and similar parts of the light spectrum that support health and do not block melatonin. And so do users on the Harmony 2 - blue light detected thread.
It makes sense that Mudita needs to consider what will work for the largest group of likely users, so I wonder about Mudita selling an optional maybe stick on clear disk for Bell and Harmony for those who want a blue light-free alarm clock. Maybe the same is possible for Kompakt.
Two possibilities are a thin, appropriately coloured film with an easily liftable adhesive, or a clip on disk.
Maybe someone knows places to buy suiltably coloured material, which holds its shape and smoothness, that people could place over blue light emitting screens themselves?