Relaunch in really low winds, forget it...
You have to live with drifting/swimming ashore and relaunch here, and go out again.
So no, a 10 m2 Drifter will get you going just below 10 knots yes, but relaunch almost impossible - this is just the way it is with hydrofoiling
Superlight foil kites rule in marginal winds, but assume this is not your liking as you dont ask about these?
A 9 m2 like your Switchblade is quite okay for most people in 10-12 knots, if average weight.
But as you are below average weight, it will be too heavy, and drop quite often, when sub 10 knots where you could ride with 65 kg.
So you need a onestrut or strutless LEI maybe 10 m2, to be able to ride in 8-9 knots.
And yes, most drift quite well.
You are spot on, get a 10 to 12 m2 strutless or onestrut kite, and a wave kite a tad smaller, that works great for both hydrofoiling in +5 knots and for waveriding on surfboards in light wind.