That might work if the stone was oxygenating the standing water at the bottom of the pot, but the spray could also affect the roots above too, keeping the stones more wet than just by normal capillary action. The air percolating up through the rocks would probably be very humid/wet, and might contribute to bacterial growth.
But then ask yourself this. Do I want my plants to look like they're on life support, connected to tubes and pumps, or do I want an attractive display to show off the beauty of the orchids themselves?
The full hydroponic method (water culture) is working very well for me so far, and it has the added advantage of allowing me to place my specimens in nice looking vases, instead of drab, utilitarian plastic pots full of rocks.
The algae supplies the roots with oxygen (which I am culturing separately in large containers with air stones), effectively taking the "life support" back one step.
If you have lots of orchids, you may need lots of pumps and tubing to connect them all. By consolidating the life support with water culture, you can simplify that a lot.
Just a thought.
Air stones
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