So, I actually had a dream about this trick the other night
once you grab with the hand that's the closest to the back binding, you release the boot.
do something cool with the ski. i.e. sack tap
then put the boot half way into the binding. when you stomp the trick, you basically click back in.
you'd need a binding that's super easy to release.
And you might want to practice at a water ramp for a while.