Started to think a little more about validations, noises, and the playing card technique.
It didn't dawn on me until a few days ago, why not try using wind chimes hanging above your bed. See if when the OBE occurrs you can move physical air current or energy from the astral to sound the wind chimes.
I'm thinking of video recording this during my naps and see if I can produce success.
Anyone would like to join me on this endeavor?