@Bigdog - Why not try to pollinate Musa basjoo with pollen from Musa sikkimensis, itinerans, yunnanensis, velutina, Chini Champa, Helen's Hybrid and any diploid fruit banana to get new hybrids with hardiness of Musa basjoo? One cross Musa basjoo x sikkimensis will be very good, one improved Musa sikkimensis with much better hardiness and at the same edible fruits. Triploizid it will result one really hardy fruit banana.
With the best
Joachim