What do the other cables carry?
That does not make sense. How can you say 8 cables won't interfere with each other? If they are bound together they will interfere, the question is whether the interference is enough to cause a problem.
I don't know what to suggest other than try it. I can't tell you it will or it won't work, but I can tell you that I think electronics is a great hobby for experimenting and trying things, to try it and see what happens.
I get the impression English is not your native language, am I correct? There are forum sections in other languages.