My recommendation is to buy bulk fiber and run it. Product is much more robust then it once was, and while it can be damaged, I've seen it tied in knots and still work. There are several purveyors out there that work with the product; we use Techlogix. Very satisfied, and they offer tutorials online on termination plus lots of ancillary hardware to meet most of your needs.

To echo my Miata driving friend, it's tough to get 18 g worth of a cable that's rated for 12 g or less...

Fiber solves the problem today and tomorrow.