Hi Joerg, glad we could help, good to see you here again!
So the Bee is first and foremost a SUP board that really works as an SUP. Then it also works as a SUP foil board or for wingfoiling. Finally for windfoiling it is also a lot of fun. For classic windsurfing in terms of planing, that will not work. But for playing around in the super small waves without expecting it to plane in 10knots, it's fine - obviously in stronger winds it will plane, but that's not the use you are talking about.
If you take the light wind wave sailing/SUP use out, and just want a light wind alternative for foiling flat water/small waves (which is super fun on North Sea locations), then a Sky Wing makes sense + a Wing - for your weight and learning probably a Sky Wing 5'8" which should then progress with your skills, a 6.0 Echo+boom, leashes for board and wing. Foil - go for a High Aspect 1750 or a Aero 2000 - I would actually choose the 1750, which like the board will progress with your skills, even if at first perhaps a touch too small for the lightest winds - I can easily go under 10knots with that, plus will handle up to 15/18knots and small waves. Later you can get a smaller front wing for the stronger days/in the waves.
The foil gear I mention above minus the Sky Wing, would be the same for the Bee, in case you feel that is the bigger priority. To your question re range, I have to say I find the wind range on the Wingfoiling a bit easier to handle in the upper end - the lower end you need to learn the technique of pumping board and wing, but I can plane pretty much as early as most windfoilers - except obviously racers who have big sails/boards...good luck!