Usually you can adapt any pattern for circs and knit it on straights. You probably need to add 2 sts for the seam, so any stitch pattern actually starts with the 2nd st and ends with one plain st left. The decreases would be worked just the same. With cable patterns all the crosses are done on the RS anyway. The WS would be done like ribbing - knit the sts that look like knits and purl the ones that look like purls.
sue- knitting heretic