Philip - i will ask about the limestone at the garden centre. i live along the canadian shield, so i know that there's tons of it around but i am no geologist and wouldn't know where to look. or how to crush it for use. but thanks for the suggestion, i will look into it.
also by airy... do you mean "loose"? like large chunks of bark and stone?
Bill - your twisty (i'm fine with that term) seems like an easy idea, but when i think about the sturdiness of the potting mix i can't see the twisty holding it any more securely than it is already. i mean it's potted, and there's a root down in there, it's not falling out, but the twisty is not going to stop it from rocking about above the potting mix where the fan is because it's so top heavy - tiny 2" root, 6" fan almost entirely above the mix.
i think the coat-hanger sounds like a better solution to prevent it from jostling. that or using a twisty to secure it to a post much the way a phalenopsis inflorescence is secured?
any way, i'll fiddle with all these ideas and report back.
i will also supply pictures, i agree that is always wisest, i've just been very busy as my wife is "budding" and we're expecting a baby in about 3 weeks