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The problem with most shorteners is that they increase Q by quite a bit, something which isn't going to help little legs which already find normal road cranks to be like riding a shire horse. That also applies to BMX cranks, of course, but to a lesser degree.
I'm looking into the possibility of grafting a chainring onto some 'Zero Q' Unicycle cranks to get short cranks with a narrow Q, at £14 these are cheap enough to allow for experimentation.
gbj_tester
Pricy option?