As usual I am the oddball. I find dominant dogs do not back naturally. Also depending on another dog to whoa the whole time while your training the dominant dog to back him is too easy to lose control of the training situation. For that reason I use the remote backer. I also plant a couple of pigeons behind the remote backer in launchers to launch while the dominant dog is backing the remote backer
Good technique right here. I never had a remote backer but I did have a wood dog I made that worked great. I did use launchers just like you. It helped reinforce the honoring of another dogs point. It was real fun watching a pointer slide to a stop on a back once trained right.
Now we had a old dog when I was a kid that would "teach" the other young dogs to back. You didn't steal Bozo's point but once.