Both "UDAP" and "Counter Assault" make "Canadian" Bear spray. As far as I can tell, the difference is that the Canadian is only 1% Capsaicin and related Capsaicinoids (the active ingredients. I have taken the Canadian purchased bear spray back and forth across the boarder. I have my proof of purchased (receipt from the Canaidan store, and the can is labeled with the canadian approval. There was one park on Queen Charlotte Islands where the ranger insisted that we have the Bear Spray.
We have also carried a .44 magnum, but we had it shipped from our US firearms dealer to a dealer in Ketchikan. Another option is if you have a guest who is coming by air to AK, and not stopping in Canada, is to have them bring the firearm in their checked in luggage. (Has to be empty, and declared). We purchased ammunition in Alaska. We had two labs, and I did not want to manage the two dogs and a shotgun going ashore. In six trips to AK we have never had a dangerous bear encounter. That does not mean that we didn't see and be close to Grizzley bears. We were very cautious, made noise, shined the spotlight at night etc--but on occasion you may come fairly close by accident. We were also in Alaska for 4 months on the majority of our trips.