Would suggest any "light" kite with power and higher AR for the ultimate low end, around 13-15m2.
Eventhough I can NOT see you can use one kite for that windrange, no way
So for winds above 10 knots, you can use ANY kite you want or have now, as any kite will hang steady in 10 knots no matter what type and weight.
In 15 knots I can easily ride with a 7m2 depower (wave) kite 22m lines no problem, and a 9m2 works fine too but quite powered.
In 8-10 knots I ride with a 13m2 really light high AR Dyno on 29m lines.
But using the 13m2 in 15 knots, I would never do on purpose
Possible to "survive" and ride ashore of course, but not much fun being overpowered so insane
In the range 8-15knots I actually can use 4 kites, depending on purpose (and because I HAVE these kites for waveriding).
I use something like this for hydrofoil freeride.
Not the full windrange, but what size I most likely would choose if going out when this wind is on :
13m2 Dyno 7-10 knots (3.6 to 5 m/s)
11m2 Furia 10-12 knots (5 to 6 m/s)
9m2 Furia 12-15 knots ((6 to 7.5 m/s)
7m2 Furia 15-19 knots (7.5 to 10 m/s)
5m2 Log 19 and up (10 m/s and up)
Average weight 77kg and using the same foil as you Niels, and always waves and or chop in open ocean, and most likely the same temperatures in NL as here in DK.
If you have 30 degree or more and stable winds, you can use the kite pleasant up much higher of course, but also have a worse low end.