Don’t let the Smart 2.0 device confuse you. Most belay devices which can be used to rappel will essentially work the same way, each with their own minor strengths and weaknesses. The main point for such a setup is whichever device you pick, I’m trying to illustrate that the device connects to your bridge, and your backup hitch is at your 2-3 o’clock on your LB loop. I started rappelling in this configuration using a Black Diamond Super 8 figure eight plate. But, I always had to switch over from the separate tether which I climbed and hunted from. I wanted a method to climb and rappel on the same tether so I could bail out whenever I wanted. So far, this seems like the system *for me. Others may have other preferences.
... but I will tell you that rappelling will be significantly easier on you than trying to navigate down sticks. With a Madrock or a GriGri, you can litterally just lower yourself down the tree to the ground, collecting each stick as you come down. I currently one stick climb, but I can tell you that if I decide I like my sticks and platform better, I will still be rappelling down. In my opinion, its the safest and easiest way to get out of trees.