Thats a great idea magiccannabus, although, if I understand your bubbler correctly, the air bubbles would mainly travel up the sides, negating some of the benefit. If you put a rigid ring (like one of my washers, except perhaps stiffer material, if you could find something appropriate) in the nylon, that's just the right size. so that the nylon is stretched out, then the bubbles should have no where to go but through it. That should churn things up even better.
I deal with this mainly by putting glass marbles on top of the airstones, it diffuses the bubbles, plus I have two stones. So far it seems to work as well as I ever need. The tea bag doesn't get bubbles through it so much, but it seeps silt out into the water where bubbles work on it. Rarely gets too foamy unless I put urine in it.