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@Dammit
Oswald is on the money here- it's going to be massively easier to use a 10 speed chain and 10 speed sprockets which are respaced, with a spacer.
You'll need to crack the largest three off their carrier, but that's handrill level work, then either use a belt sander to adapt some spacers, or shop that out.
I can make them with my mitre saw to a good enough level to test the theory out.
The 7800 freehubs are no longer available, I'd want to maintain one in good condition.
Grab a 10 speed 105 cassette, some spacers and some handtools and make a prototype- and save yourself a fortune.