The reason nylons make the feet more ticklish, especially if they are very thin, is that the nylons let the fingers move and slide across the foot faster, but are so thin the foot feels every touch.
That's why socks are a tad less ticklish, because the thickness blocks more sensation.
Therefore, the cowboy thingy probably wouldn't work, unless they were REALLY ticklish.
But as you said, the thing about nylons is.....they feel GREAT! They're soft, smooth, you can feel the warmth of the feet, the thinner, sheerer, the better the feeling.
(That's why I LOVE sheer toe - aside from it looking like a whole foot!, the reinforced heel and toe doesn't take away from the joy of seeing/playing with each toe.)
I'd never WANT to use any "tools" on them, my hand will do all the work!
I think that's why so many people don't like when the producers use any tools on nylons.....