I finally booked this itinerary for family of 5 in business for next year:

yyz-lis (stopover)
lis-zrh-bkk-han (dest)
han-bkk-icn-lax-yyz

I got all segments in biz except bkk-icn. Aeroplan phone agent said there were only 3 seats even though the Aeroplan website/app indicated 5. So, I booked 3 in biz and 2 in Y. Today, I see that there are still 2 biz seats in Aeroplan app as well as in the United MileagePlus app (here it says 2 tickets left at this price). Called in to ask the agent to upgrade but was told that even though she sees the availability on the website, she gets an error when trying to book... Does anyone have any suggestions?