If the OP (or anyone) wanted to try this, I guess one could do it from say 80m or 90m, flat ground, over something like thick soft vegetation (reeds ? thick ground cover / hedge ? an empty childrens jumping castle, lol ?), and try a restart almost as soon as CSC stops the motors.
Not sure how long terminal velocity takes, but that should be safer then trying from higher, though not sure how much higher one should be going, only another 30 or 40m permissible in most places.
Also, I would do a lot of CSC on the ground, with props on for real life motor load, to work out exactly how long it takes for the motors to restart.
Ie. Your motors stop, how long until a CSC can be done before restart occurs, immediately, 2 seconds, etc ?
How long until the motors take to stabilise after restart ?
Would need to know this to ensure test heights are adequate.
I think my early interest in YouTube vids, and when they even pop up last year or so, is if you accidentally do a CSC, you know how it might respond to save it.
Remember flying any drone for the first time ever, my sons P3 many years ago, got it up was zooming all over the place at my workshop open yard, having a ball.
After landing he said, oh, never do this \ /, or / \ in flight.
Great, NOW you tell me !!