A medium format Speedbooster / Lens Turbo

An ideal candidate for such device the Pentax 67 45mm

Dear Metabones, Zhongyi, and every other Chinese knockoffs manufacturer out there: I have a suggestion for you.

I realize you will be skeptical about releasing what would indubitably be perceived as a niche product. But a Speedbooster / LensTurbo / focal reducer to adapt medium format lenses on full format 35mm cameras would be absolutely terrific.
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