The long lengths of twisted-unshielded can work, but it will depend upon your electrical environment. What are the possible 'contaminants' in close proximity to your runs? If there are many and you have to use that kind of length, then I would certainly consider a shielded cable for the job.
My ultimate recommendation would be that you try to shorten your intereconnects and use longer speaker cabling.
If you decide you need to try shielded cable, here are some inexpensive alternatives: River Cable, Signal Cable and Cobalt Cable. I wouldn't know how closely they could mimic the KCAG, but changing geometries would likely have an impact on your sound.
My ultimate recommendation would be that you try to shorten your intereconnects and use longer speaker cabling.
If you decide you need to try shielded cable, here are some inexpensive alternatives: River Cable, Signal Cable and Cobalt Cable. I wouldn't know how closely they could mimic the KCAG, but changing geometries would likely have an impact on your sound.