I'm not 100% sure, but I think this one needs to be able to collect some water rather than just absorb it from the air like Tillandsia ionantha and the like. For the string, I think you would be better off with T. ionantha and similar species whose leaves are silvery and turn green when wet. Those just collect moisture from the air as well as appreciate misting. I think T. cyanea likes it better mounted.
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"We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"
Goblin Market
by Christina Georgina Rossetti
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