This makes me think about the premise of putting blukote on a wound to cover the 'lethal attractant' of the blood.......I've found blukote to be more attractive to curiosity pecking than the wound blood itself, even by the wounded bird who wants that foreign substance off it's body and may preen...
I don't buy the red color as a 'lethal attractant'...
...otherwise chickens would all shred each others combs and wattles.
And they will eat and drink out of other colored containers.
I wouldn't worry about the color in the least.
They will be wary of anything new you add to coop, but soon get used to it.
Use at least 1/4" rope, way stronger than a chicken could break by landing on it...
...unless you put it where they might chew on it-which you should avoid.
Why do you need...