There is PVC pipe made for electrical (romex) installation, available at Home Depot and similar stores (I like the dark gray). There are "C" shaped clips that mount the pipe to the wall, so it looks like a regular electrical conduit (especially in a loft). I use this system I am describing to you in my photo studio, for air hoses to my turntable. Air hoses don't do well when smashed either. The good news is that the solution I am suggesting is very in expensive, and can be removed later if you desire. The PVC can be cut with a hack saw, and it is really not necessary to even glue the joints, just force it into the coupling connectors and your done! The other good thing is this method protects the cable from light as well. Direct light can affect the performance of the cables ability to distinguish digital signal, and the ultraviolet rays can break down the "glass," actually a plastic.