Im not familiar with your set up.
Hopefully you have a stopper ball on your 5th line.
This is easy if you have a tiny amount of capacity to learn a new kite skill.
If the kite falls into the U position in light wind.
1) Reach above your depower strap, grab and shorten the 5th line.
The kite will fly up in the sky. Alittle like a box kite and this is a good thing in pounding shore breaks.
2) When it is has a bit of altitude quickly grab a side leader line.
With a big turn the kite will start relaunching or may even just spin around in the air and fly.
Merry Christmas