12 ft pair of thick speakers cables?? Can they be cut downt to a 6 ft pair??

I have a 12 foot pair of Harmonic Technology Pro-11 Plus speaker cables. Can they be cut down to a 6 ft pair and re-terminated with WBT banana jacks. The 12 foot pair is awkward and difficult to place, and WILL NOT stay put on "Porcelain  Cable Elevators"   

I  really like the cables and don't want to necessarily sell them  The "new"  Harmonic Technology company blew me off when I ask if they could do it??   Are there outside services companies that will do it for a reasonable price??. 

Thanks,  SJ