It's really hard to strip Nordost Red Dawn speaker cable without breaking the fine wires. One can buy a special stripping tool from Madison in the USA but the tool itself is not very accurately made and it is still rather difficult to use. One can use a sharp craft knife to strip each of the fine wires individually but it is rather painstaking, and if one breaks just one of the wires out of the many for each signal path, one needs to start the whole lot again to get usable equal lengths. IOW it is a total pain in the arse to terminate oneself, whether speaker or signal.
You could perhaps split the speaker cable down the middle to give 10 strands per line for signal cable, but do you really want to be stripping 80 of those fine strands perfectly to make one pair of signal cables? I appreciate it looks like there can be a considerable saving over buying ready-made Red Dawn i/c, but I advise you to do something else. Rather than think that you need Red Dawn throughout, I suggest you accept one of the off the reel wires or ready-made cable alternatives. For instance, one can buy silver wire and teflon sleeving separately, which will surely be pretty much the same electrically, IMHO.