Some of the Japanese manufacturers made 27" (68.5cm) frames, but they were typically for the most popular market segment, which was upper entry level. Hence those VALite Fuji models and others, like the Miyata 110/112 variants. For slightly sportier geomtetry, there was at least one year in the very late 1980s that Miyata offered the 312 in this size. It had a full CrMo frame but a Mangalight fork. IIRC, the down tube was STB (splined, triple butted) which would be a welcome contributor to stiffness on such a tall frame.