Re: TS2412 riving knife and other accessories
regarding the ZCI, anything will do, like a small piece of wire hanger attached with a screw that keeps the rear edge of the ZCI from lifting up. i use whatever sheet metal stock i have lying around and make a piece about 1" wide by 2" long. i drill a hole in the metal piece and a corresponding hole in the outfeed end of the ZCI, countersinking the hole in teh ZCI surface. the metal tonge is then bolted to the ZCI using small machine screws and nuts.
regarding your description of a fabricated riving knife, it sounds like all you're achieving is a small splitter. it will bevel just like the stock splitter but will not have a blade guard and will be smaller than the stock splitter. it still will not move up and down with the blade, or accomodate non thru cuts lower than the fixed height of the splitter, like a real riving knife does. i've just gotten another stock splitter/blade guard and removed the blade guard. while this is not ideal, it gives me a splitter, which is crucial to safe table saw operation, yet removes the blade buard, which can be annoying to deal with. not ideal or optimal, but it works for me. HTH.
there's a solution to every problem.....you just have to be willing to find it.