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Surprised there's been no suggestions of selling out to another components/engineering brand. Royce or BETD/Goldtec might be good matches, both work in the general drivetrain area but neither have their own crank design.
Hope could have worked a few years ago, but the Hope and Middleburn cranks have too much overlap in their target usage/market and the designs don't really work as complementary products within a range.
Middleburn. RIP.
https://cyclingindustry.news/uk-cycling-brand-middleburn-components-closes-down/