Vintage Mac Community Begs Manufacturers for New Supply of Rare Dongle as Resellers Charge $250
“I am deeply concerned about the discontinuation of the Belkin F2E9142-WHT ADC to DVI cable."
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Looks easy enough to make your own.
https://lookanotherblog.com/diy-adc-adapter/
That project is even a bit more involved because it looks to power an Apple display from a generic dvi video card. Going from DVI to ADC should be even simpler than the project you mentioned!