1. Depends on your luck, eventually a CBSA officer will ask why you don't have BC plates, whether you have imported the vehicle etc.
2. You can probably get away with not having a Canadian license but it is a risk too as official window for swapping license is not much,90 days or something.
How have your border crossings into Canada been so far? Don't they ask you "where is home", question about car plates, purpose of visit etc.
Curious to know how its going as I would like to try this in the future