Ok, I've got some good news!

I've finally found a bad quality version of this movie, but in my language...italian.

I watched it very quickly to find the sneezes, and there are 1 sneezing fit from dragons by pepper(the one in the video posted here before) then the others are only from the green dragon.
There is the one when he was a baby, then I've found one by getting his nose tickled by a punch(!?), one by perfume(very nice build-up with watery eyes), one by tickle but this time for a fake red nose getting stucked in his nostril, one by getting flowers inside his nose.
I don't know if there were more, I need to watch the full movie...and maybe I can do it this afternoon.
I was a little disappointed because there are some scene where a sneeze could happen but it doesn't... like in a forest where the dragon is surrounded by a peltals cloud and in a library full of dust where the main characters had a fight with Dragon and the Wizard...