I wonder if pulling it out, drying it, and replanting it would speed up the process vs leaving it in the tank. In other words, fooling it into thinking its next season already. I don't have any Apons currently but next time I grow some I have a plan: Get a few and swap 'em out for year round enjoyment. As one starts to go dormant, stick a dry tuber right next to it and so on. Boom.
92% of all statistics are made up on the spot.