I see it all like you.
And to me, being hooked, even with a very long depower line and or locking bar on line has nearly nothing to do with unhooked.
And due to dynamic wind window also a unhooked Peak can flap if you change angle of attack during moving it inside and boarder of wind window or as permanently move yourself on a wave against the kite.
It is not the goal to have a heavily flapping overpowered, depowered kite in your hand while riding the wave, but the opposite:
On the wave with the foil you want a well balanced kite with just enough power to start you with 1-2 loops (which is when underpowered easier unhooked) and then a kite that behaves as neutral as possible when you fly it on one streched arm mostly above your head. Like this you wont be able to forget the peak completely but you wont feel no more pull. You will just have to controll that the lines don't start to go to much slack to not risk to sink it, that's why it is for sure not a recommendation to everyone to try.
And yes before you hook of you depower with the trimmer, but if never done before it is not a Peak in the water to try it first time.
Thinking about it, it could also be worth a try to not just hook the suicide leash the normal way, but above the bar (or even with a short backstallsafety /two extra lines on level of trimmers ...) which could increase the chance if releasing the bar and crashing the kite to be able to relaunch, as then backlines should stay permanently powered / tensioned as much as before or possible, which is very important for Peak relaunches ..... will try this next time.
... have to go add those lines