Vietnamese Pho (most variants anyway- iirc Hue type is already spicy) noodle soup have the spice optionally added by the end user. Similarly the rice and vermicelli dishes are not inherently spicy (the fish sauce may not be to their liking but again that's typically on the side). The little baguettes (banh mi) are typically a bit spicy and include stuff like head cheese but are pretty delicious. You can get plenty of rather good Viet food in Canada, so worth getting started early. Don't miss the coffees.
For Thai food there is always pad Thai (noodles). Again, domestically available. And there are enough foreigners they can prollyprobably get something that looks even more familiar.
I don't recall Cambodian cuisine that well, but I don't think it is particularly spicy or weird tasting. I recall their pizza being quite good. I'm unsure of the legality but one of the available toppings may be cannabis, aka 'happy pizza'.
Good job you are not going to Indonesia.
Anyway, as I discovered with my young (at the time) son, hunger is a powerful motivator.
