I like the lateral thinking Evo! I have to say, I quite enjoy the surprise of just slowly closing the throttle with nowhere really obvious available - BIG judgment call in terms of survivablity here (I always favour running off the end at 20 knots to smacking into the fence at the beginning of the field at 70!)
My advice is to not try anything new on your test day. Stick to what you know. Also, this time of year think WIND! It might be calm the day before and blowing 20 kt at height the next. Either way your glide gradient will be significantly different.
Good luck.