There was (& the internet being what it is) still will be a series of plans to recreate the KH style splitter. It was made in two halves L&R out of ply, but with a liberal dose of Australian ingenuity & a mould made, glass fibre or even carbon could be used.
Obviously best if good fortune.
I can do no more than tell you of it’s existence, it goes under the found & subsequently lost heading in the junkyard of my brain.
M