The premise that you would be safer in a hammock is really questionable. As others have said, you are not going to be able to get above bear range, just moving up a tree. But more to the point, you are not going to have bear problems anyway. The reason is that if you want to cross Canada on a reasonable budget, you are going to have to do a lot of free camping. Bears do not come to those places, they hang out in a few well publicised mega camps like Yosemite, and the Smokies. And of course in Canada the rockies. Just having a high population of bears does not mean they eat you. If you want to bait bears, it takes weeks of laying out a bait in the right place day after day, so they can find it, and even having bears hitting the donuts does not mean they would start chewing on humans. While it isn't hunting per se. Baiting bears takes a lot of work you have to choose a very specific place. And every day you pull up the tent and move on when camping, the chance of baiting a bear is not that great.
Also, if you are an American, you may not be aware how crappy the game distribution is up here. Nothing like the US. They can be bigger, but they are also sparser in distribution. I saw more deer and bear in either Oregon, or Florida, in one day than in Canada in over 50 years. I have seen a fair amount in Alberta and BC also... Just recently someone reported they had seen "the largest black bear they had ever seen" on our property in NB. I go there 3 months a year for the last 50 years, I have never seen a bear. I see their droppings all the time, but never see them.
Hammocks are great if you can sleep in them. There are a lot of guys who are really into them, and post videos, and hang out at forums. Then after you follow one of these guys who makes videos and tries out all kinds of hammocks, and can be seen napping in them etc... Turns out he has never slept through the night! Most of the into it guys use separate hammocks and specially contoured tarps. It is tough to buid a credible tent/hammock system with no overlaps. I am sure lots of people say they can do it, but the results would be like some home made sleep system that virtually nobody could stop laughing at. Tarp camping is a whole other thing, and not that popular with most people, yet that is pretty much at best, what you are going to get with some hybrid system. I am working hard on the whole tarp thing, but check past threads, very little in the way of users. I predict you will have bought a tent by the time you hit the next big town.
Having done long sections of the cross Canada thing, I have tried out the idea of a light tent and a hammock. I go ultralite, so an extra few pounds of hammock were no problem. I did it for the stealth potential because there are so many places that are not private, but are heavily overgrown with tree farm like stuff, and would be great for hammocks, but too tight for tents. Also there are manufactured slopes like cuts on rail trails that are steep, have well spaced mature trees, no place to pitch a tent. Alsot no body, or for that mater no bear, are going to bother you.
Best overall tent is an x frame tent. Bugs are your big problem.
http://blackdiamondequipment.com/en/...1.html#start=2
I have been using tents like this for 40 years. Good feel inside, not too bulky.