For those still interested in this topic,here a list of non-standard road double "very" compact cranks i know:
Sugino: OX601 and OX901D, 110/74mm.
Renè Herse: 70mm.
Specialitès TA: Carmina and Vega, 94mm (with spider).
Middleburn: Double Incy, 110/58mm (with spider).
White industries: VBC, variable mm (with spider/chain ring).