If you actually want/need bear spray use bear spray and skip thinking about wasp spray or other alternatives. Personally I wouldn't even consider carrying either. Even in bear country, it really is not necessary IMO. There are a lot of other dangers that are more likely than a bear attack. They range from traffic, to lightning strikes, to an anaphylactic attack from a bee sting and are all more likely than a bear attack even in Canada or Alaska. In the lower 48 attacks are rarer yet.

Among all outdoor activities, there are only a few deaths per year associated with bear attacks in all of North America. In the lower 48 there area lot fewer. I don't recall ever reading about a death by bear attack among touring cyclists anywhere.