Yes, your guess is correct, there is no way this combination of flights will populate in any award search engines, reason being is, I have to wait for the day that NH has 3 business seats departing from Haneda to go to Sydney, and still within the mpm allowed. Interesting thing is Aeroplan agent allow me to stay in Osaka for a full day 24 hours, and Singapore for 24 hours and 5 minutes in additional to Sydney as the POT and Taipei as a stop over, I guess there is a bit of leeway nowadays for connections^^