I believe we just had this discussion recently, I have a shortened version available from OEX, a 6-8 footer cut down to 5 ft I think, works fine, you have to modify the sabiki to fit all inside rod, kind of a hassle, I usually bring a sabiki and use one of the rods I brought to make bait and put the sabiki away when done, it's nice to have a dedicated sabiki, but it takes up a rod holder and they are a bit cumbersome.
Others have made them out of pvc again cumbersome, I guess it will come down to personal preference...
In a kayak, I doubt I would buy a dedicated sabiki rod again having done
it already