Is the IKO method unknown to you gentlemen?
I can't fault this system;
Enter the boat with only the struts inflated and the kite lines unwound in a bucket.
Drive out to your spot.
Pump leading edge.
Kite pilot jumps overboard, with bar and swims across wind.
The lines start to come out of the bucket. (no speedy unwinding required, never had a tangle)
The boat is manouvered up wind until the lines are nearly taught.
Boat at slow speed (relative to kite pilot, still swimming) keeps kite depowered until pilot is ready.
Kite is let go at the edge of the window....
Kite in the air and board delivered to pilot by boat (slightly upwind)
I have done this a few times and never had a problem.
No risk, like with drift launching. 2 people required in boat. Or 1 awesome boat driver.