I’ve cycled to Copenhagen - solo camping, no route planning to speak of. My path was roughly Hoek, Den Oever, Groningen, Bremerhaven, Flensburg, Kolding, Odense, Copenhagen. That’s the bigger towns, not where I stopped, but just to give an idea of the route. I rode for eight days on a road bike with rear panniers.
Unloaded your route is definitely doable, especially if the weather is good and the prevailing SW wind remains kind. Whether it will be enjoyable is another matter. Will you be solo or in company? Are your overnight stays fixed or can you be flexible?
Ahh, I see you went further North, how was that?
I guess it's worth mentioning that I'm doing it for 2 reasons, as a physical challenge/adventure and to raise as much £££ as I can for The Christie hospital in Manchester. The enjoyment would be nice, but not my primary purpose ;-)