The critical detail of cable that makes balanced audio work is tightly twisted pairs. The pairs being twisted together insures that induced noise is equal in amplitude and
phase in both wires, which allows it to be cancelled by the input
stage. If the
snake channels are not twisted in pairs, you will have lots of noise and crosstalk.
Running
line level audio on unshielded, twisted pairs usually works great, as long the output and input stages are both truly balanced. I would be leery about running
mic level without individual shields. I can't say that I've ever tried it in a serious way.
Given the amount of time and materials it would take to terminate the cable, I would spend the extra money to use proper cable instead of the camera stuff.